emu
auk
emu
LEK
Auk
tit
Emu
Coo
One possible three-letter word for "bill" would be "IOU." Another might be "neb," which is a bird's bill.
* Albatross * Sandpiper * Nighthawk Or jokingly, a bird that has eaten a 9 letter word.
FLY
Emu or Moa (but they're extinct!)
Bee.