Vocabulary

Words That Start With O

As we all know, English is the most used and spoken language around the world. Mastering 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.

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!

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List of 100 words that start with letter 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 on 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 of studying English vocabulary available on our website, so don’t hesitate to visit our website for other useful lessons.

The more your vocabulary are 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!

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