"rasping" means "to have trouble breathing, to breathe noisily. Someone who is soon to die may begin rasping as it gets more difficult for them to breathe.
I can think of no single common English word that would mean "to breathe perfectly/ healthily"
exit
Provoke.
sooth
The sound of the rake rasping against the pavement filled the garden.
Chronic bronchitis can lead to a rasping cough that is difficult to cure.
Participant and Player.
very surprised
Antonym means the opposite.
roared, premature, early
the antoynm of forage is "distribute"
An antonym for investigate is ignore.
Yes, "rasping" is an onomatopoeic word because it mimics the sound it describes. The word itself gives a similar impression to the harsh, grating sound of rasping.