Gee!, Oh!, Wow!, Oh, wow!
ē (ending with a glottal stop)
What?!, Oh!, Oh my God!, Oh no!
aita (with a glottal stop at the end)
Good-bye!, Bye!, See you again! (colloquial)
nose, muzzle (of a dog/horse), trunk (of an elephant)
aha, I see, okay (colloquial)
No (as a reply; colloquial)