flowing vs emission

flowing and emission both are nouns.

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

As nouns, emission is a hyponym of flowing; that is, emission is a word with a more specific, narrower meaning than flowing:

flowing (noun)	emission (noun)
the motion characteristic of fluids (liquids or gases)	the act of emitting; causing to flow forth
	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

flowing (adjective)	emission (adjective)
designed or arranged to offer the least resistance to fluid flow