Dictionary definitions that start with the letter: O (3640 entries)

office boy
office building
office furniture
office of homeland security
office of inspector general
office of intelligence support
office of management and budget
office of naval intelligence
office staff
office-bearer
officeholder
officer
officer's mess
official
official document
official emissary
official immunity
officialdom
officialese
officialise
officialize
officially
officiant
officiate
officiating
officiation
officious
officiously
officiousness
offing
BTW, Why won't you become an editor?