Ogre, generally
Ogre - as in Shrek
Another word for water that starts with the letter 'O' is oxygen dihydrogen.
originonset
Orator is another word for speaker.
Onus
other
Oh, I'm rich
Orc
outstanding i hope this helps B)
oblong.
oblong; such as an oval or rectangle
the word that starts with the letter o isonizalation glad to help