Obliging is a synonym for obedient. It begins with O.
Offers?
obi
obscene
The word "obedient" has four syllables.
dis
One option is the word officials.
Owing
Octave
"Obediant" is not an English word. The word obedient has four syllables. The syllables are o-be-di-ent.
Origin
People can be described as being obedient, observant, odd, offensive, old-fashioned, outgoing, outstanding, overbearing or overconfident. They begin with the letter o.
The Maori word for talk starting with a "k" and ending with an "o" is "kลrero."