emission vs emergence

emission and emergence both are nouns.

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

As nouns, emergence is a hypernym of emission; that is, emergence is a word with a broader meaning than emission:

Other hypernyms of emission include egress, egression.

emission (noun)	emergence (noun)
the act of emitting; causing to flow forth	the act of coming (or going) out; becoming apparent
the occurrence of a flow of water (as from a pipe)	the act of emerging
the release of electrons from parent atoms	the becoming visible
any of several bodily processes by which substances go out of the body	the gradual beginning or coming forth
a substance that is emitted or released