Here is a list of most popular words in English that are beginning with letter O. Click on each word to learn more about its meaning, definition and its usage.
O
oak oath obese obey object obligate observe obsess obvious occasion occupation occupy odd odor off offer office often okay old on ongoing onion only ooze open operate opinion opposite optimism option oral order ordinary original other ouch outcome outdo outer outfit outgrow outrage over overdo overwhelm owe owl own
Essential English Dictionary
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