Yes.
To list a few:
Orc. Ohmic. Optic. Opthalmic. Organic. Orthodontic.
Chicago
concerto
cosco
A seven (7) letter word that starts with M and ends with O: memento
ow
into
leggo!
CaimitoCherry TomatoClove Caimito
Cacao
Omega.
ox onyx
Impasto or inferno.