3000 từ tiếng Anh thông dụng

O’clock	Officially	Organize
Object	Often	Organized
Objective	Oil	Origin
Observation	Ok (okay)	Original
Observe	Old	Originally
Obtain	Old-fashioned	Other
Obvious	Once	Otherwise
Obviously	Onion	Our
Occasion	Only	Ours
Occasionally	Onto	Ourselves
Occupied	Open	Out
Occur	Opening	Outdoor
Ocean	Openly	Outdoors
October	Operate	Outer
Odd	Opinion	Outline
Oddly	Opponent	Outside
Of	Opportunity	Outstanding
Off	Oppose	Oven
Offence	Opposite	Over
Offend	Opposition	Overall
Offensive	Option	Overcome
Offer	Orange	Owe
Office	Order	Own
Officer	Ordinary	Owner
Official	Organization