Words That Start With O
As we all know, English is the most used and spoken language around the world. Mastering the English language will help you attend international schools, get a good job with a high salary, enhance your overall knowledge, and make friends with people all over the world. However, learning English isn’t always easy, especially when it comes to vocabulary.
The 100 most common English words that start with O. In this lesson, we are going to take a look at an ultimate list of words that start with O.
Specifically, in English, there are too many new words to learn and some of them are too strange for us to remember. Therefore, “how can we study vocabulary efficiently?” is always the question unsolved to numerous English learners. You know what? To successfully conquer your study journey, you should begin first with the most common words. But where can you find these words? Learn English In A Fun Way website is the answer. There are lists of A-Z English words updated on our website for you to study and better your vocabulary. Today’s post will introduce 100 very cool English words that start with O, let’s get started!

Words That Start With O
List of 100 words that start with O
NUMBER | WORDS | VOICE | EXAMPLES | VOICE |
---|---|---|---|---|
1 | Object | The boat bumped against a solid object. | ||
2 | Objected | He strongly objected against the decision. | ||
3 | Objective | Our objective must be to secure a peace settlement. | ||
4 | Objectives | You must set realistic aims and objectives for yourself. | ||
5 | Obligation | You are under no obligation to buy anything. | ||
6 | Obscure | The details of his life remain obscure . | ||
7 | Observation | Facts can be established by observation and experiment. | ||
8 | Observe | We must observe the correct protocol. | ||
9 | Obsolete | New technology has rendered my old computer obsolete. | ||
10 | Obstacle | Fear of change is an obstacle to progress. | ||
11 | Obtain | I haven’t been able to obtain that book. | ||
12 | Obvious | Her obvious popularity made me feel inferior. | ||
13 | Obviously | We’re obviously going to need more help. | ||
14 | Occasion | A funeral is a somber occasion. | ||
15 | Occasional | The weather was good except for an occasional shower. | ||
16 | Occasionally | We go for walks in the fields occasionally. | ||
17 | Occupation | Please state your name, address and occupation. | ||
18 | Occupy | How much memory does the program occupy? | ||
19 | Occur | When did the accident occur? | ||
20 | Occurrence | Complaints seemed to be an everyday occurrence. | ||
21 | Ocean | Have any fish been contaminated in the Arctic Ocean? | ||
22 | Odds | It’s odds on that she won’t come. | ||
23 | Offense | Child abuse is a punishable offense. | ||
24 | Offenses | They should be probated for first offenses. | ||
25 | Offensive | His mode of doing business is offensive to me. | ||
26 | Offer | Sarah rejected her brother’s offer of help. | ||
27 | Office | She was mimicking the various people in our office. | ||
28 | Officer | He telephoned the duty officer at regimental headquarters. | ||
29 | Official | He attended in his official capacity as mayor. | ||
30 | Officially | She is officially registered disabled. | ||
31 | Officials | Officials claim the chemical poses no real threat. | ||
32 | Offline | I work offline most of the day. | ||
33 | Offset | Their wage increases would be offset by higher prices. | ||
34 | Offshore | A gentle current carried them slowly offshore. | ||
35 | Often | How often should I take this medicine? | ||
36 | Okay | Is seven okay for you? | ||
37 | Older | Baseball grew on me as I grew older. | ||
38 | Oldest | This is the oldest Hebrew manuscript in existence. | ||
39 | Olive | Heat the olive oil over a moderate flame . | ||
40 | Onboard | Onboard circuitry facilitates standby battery charging. | ||
41 | Once | If necessary I can come at once. | ||
42 | Ongoing | There is an ongoing debate on the issue. | ||
43 | Online | We planned to build an online database. | ||
44 | Only | They’ve only sold thirteen tickets so far. | ||
45 | Onscreen | That heroic figure never appears onscreen. | ||
46 | Onslaught | The city resisted the enemy onslaught for two weeks. | ||
47 | Onto | The waves frothed as they crashed onto the beach. | ||
48 | Open | Her eyelids fluttered but did not open. | ||
49 | Opened | She opened her mouth to say something. | ||
50 | Opening | Her clever opening gambit gave her an early advantage. | ||
51 | Openly | He openly boasted of his skill as a burglar. | ||
52 | Openness | He demonstrated an openness to change. | ||
53 | Opens | One sin opens the door for another. | ||
54 | Operate | How do you operate the remote control unit? | ||
55 | Operation | The operation had left her susceptible to infection. | ||
56 | Operational | The boat should be operational by this afternoon. | ||
57 | Operatives | We probably have the best field operatives in the world. | ||
58 | Operator | Dial 100 for the operator. | ||
59 | Opinion | Public opinion can force the government into action. | ||
60 | Opponent | In debate he was a formidable opponent. | ||
61 | Opportunity | Marx never lost an opportunity to castigate colonialism. | ||
62 | Oppose | We would vigorously oppose such a policy. | ||
63 | Opposite | He pointed to something on the opposite bank. | ||
64 | Opposition | Delegates expressed strong opposition to the plans. | ||
65 | Optic | The optic theory originated with Einstein. | ||
66 | Optical | He has an optical defect. | ||
67 | Optimal | The reader can verify that this optimal solution is. | ||
68 | Optimism | Recent results must give some cause for optimism. | ||
69 | Optimistic | Your view is too optimistic. | ||
70 | Optimization | The use of genetic algorithm optimization. | ||
71 | Optimize | They need to optimize the use of available resources. | ||
72 | Option | Going to college was not an option for me. | ||
73 | Optional | The other excursions are optional. | ||
74 | Oral | We’re having an oral test this week. | ||
75 | Orange | That’s a funny combo – pink and orange. | ||
76 | Orbit | Mercury’s orbit is fairly eccentric. | ||
77 | Orbital | The viewpoint is perpendicular to the orbital plane. | ||
78 | Orbiting | A linkup of two orbiting spacecraft. | ||
79 | Ordeal | He spoke frankly about the ordeal. | ||
80 | Order | The captain gave the order to abandon ship. | ||
81 | Ordered | He ordered the army to invade at dawn. | ||
82 | Ordering | His big brother is always ordering him about. | ||
83 | Ordinary | Her paintings are of ordinary everyday objects. | ||
84 | Organic | Liver is an organic part of human body. | ||
85 | Organisation | We can’t do without the help of your organisation. | ||
86 | Organization | The move would cause irreparable harm to the organization. | ||
87 | Organize | She helped organize the party. | ||
88 | Organizer | The conference closed with a short speech by the organizer. | ||
89 | Organizers | We need more doers and fewer organizers. | ||
90 | Orientation | The course is essentially theoretical in orientation. | ||
91 | Origin | There are many theories about the origin of life. | ||
92 | Original | Let us revert to the original subject. | ||
93 | Originally | The island was originally circular in shape. | ||
94 | Other | One brother is a cashier and the other sells. | ||
95 | Others | People have become indifferent to the suffering of others. | ||
96 | Otherwise | Her heels gave her the height she otherwise lacked. | ||
97 | Ought | You ought to work harder. | ||
98 | Ourselves | Despite the bad weather, we enjoyed ourselves. | ||
99 | Oust | I’m sorry to say nothing could oust a computer. | ||
100 | Ouster | The committee’s chairperson is facing a possible ouster. |
Above is a huge list of commonly used English words that start with O. How do you feel about it? Why don’t you take them down in your notebook and begin practicing with them? Learning English vocabulary can be a very fun and rewarding journey. However, it can also seem difficult or frustrating sometimes. But don’t worry! As you make efforts to study and get some top tips on how to learn English words effectively, you will certainly succeed. There are articles related to tips for studying English vocabulary available on our website, so don’t hesitate to visit our website for other useful lessons.
- Learn More: Words That Start With P
The more your vocabulary is enhanced, the more your English speaking, grammar, vocabulary, listening, and reading skills are improved. Hence, studying vocabulary is a must when it comes to studying English. Work hard in silence and let your success be noise!
Thank you for learning the lesson words that start with O and see you in the next lesson!