[O], one, [24/564]

Obeisaunt, obedient, [13/266], [32/814]

Object, presented, [168/4889]

Occupye, to seize, [146/4227]

Offence, hurt, damage, [180/19]

Offensioun, offence, [20/473]

Olifuntȝ, elephants, [80/2223]

Onknowyn, unknown, [180/6]

Onlyche, only, [171/4968]

Onone, Onoon, at once, anon, [23/553], [74/2027]