Offers?
obi
obscene
One option is the word officials.
Owing
Obliging is a synonym for obedient. It begins with O.
Octave
Origin
The Maori word for talk starting with a "k" and ending with an "o" is "kōrero."
another word for chasm that begins with o omission opening oversight
Another word for water that starts with the letter 'O' is oxygen dihydrogen.
Another word for in front is, obverse.
origin.