(n) automat
(n) automaton
(n) oatmeal
(n) automobile
(n) autoracing
(n) auto-raise
(n) autoload
(n) self-locking (wasei: autolock)
(P)
(n) eau de toilette (fre:)
(n) owner-chef
(n) ornament
(n) overkill
(n) overdub
(n) over par (golf)
(n,vs) overrun
(P)
(n,vs) (1) overlay
(2) (comp) overlay (segment)
(n,vs) (1) overlay
(2) (comp) overlay (segment)
(n) overcoat
(n) overture
(n,vs) overpunch
(n,vs) (comp) overflow
(n) overhead
(n) (comp) overlap
(n) (comp) OPS
(n) opening
(P)
(n) open-air
(n) convertible (wasei: open car)
(P)
(n) open door
(n) (comp) open price
(n) open account