Here are some names of bugs that begin with the letter O:
Roach
roach
D.O.A.
Goat
floating
oa
D.O.A.
The letters OA make the long O sound in goal
boba
No, "oa" is not a word. It is simply a combination of the letters "o" and "a" and does not have any meaning in itself.
The insect is a hornet.
Bug.
Insect