Respuesta :
Onomatopoeia: The formation of a word from the sound that word makes; A poetic structure of words that convey how something sounds.
I believe your answer is "moaning" and "groaning". When said, both sound as if you are doing the action of the word.
If you can pick more than two, than I might suggest "knell" as well, although it does not quite sound like the action. To knell is to ring solemnly.
Sorry this answer is late, but I thought I'd put it here for anyone still looking.