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	EXAMPLES
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!