emission vs expelling

emission and expelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
emission	Yes	No	No	No
expelling	Yes	No	No	No

As nouns, emission and expelling are synonyms defined as:

emission and expelling: any of several bodily processes by which substances go out of the body

Other synonyms of emission include discharge.

emission (noun)	expelling (noun)
the act of emitting; causing to flow forth	any of several bodily processes by which substances go out of the body
the occurrence of a flow of water (as from a pipe)
the release of electrons from parent atoms
any of several bodily processes by which substances go out of the body
a substance that is emitted or released