As a spin-off from this comment: If a human exclaims something like "ouch!", I believe it's considered an interjection. But if a pig exclaims "oink!", what is the part of speech? And if a bell goes ...
I saw this other question, but it's not quite what I'm asking. A bell makes a sound. How would you write that sound in English? As an interjection, e.g. "boom!" I'm sure it varies with the type and ...