oriental
o my god
the word that starts with the letter o isonizalation glad to help
oaf.
oral
origination
overwrought
Overwhelming is a synonym for awesome. It begins with O.
Omega
Original?
One example of a word in French that starts with the letter "o" is "oiseau," which means "bird" in English.
Obscure is a synonym for confuse.
Omitted.