- one who ruins
- one's belongings
- overtolerance
- one's all
- one's appearance to be rare
- other's job
- of or belonging to another
- of the first order (often in derogatory contexts as
- on this account
- osip mandelstam
- oral pilorum
- oral tuberculosis
- oral lesions
- oral inhalant
- one who indulges in excessive sexual intercourse
- out loud
- overindulgence
- oculism
- on the march
- opencast
- opencut
- one who makes efforts
- opening balance
- one who uses
- one who knows law
- one who knows the emotions (of another)
- one who makes taunting
- open_air
- open wound
- only an elephant can bear the elephant's load
- one hundred fifty_five
- oxygen blackout
- oxygen breathing
- one_seeded
- one_seed
- one sided
- old italian
- old saxon
- onomatopoeic
- onomatopoetic
- obelionic branch
- officialdom
- opus
- over_ side
- one of the four ages_viz
- offspring
- one who extends hospitality
- offshoot
- organising
- orchestration