flow vs emission

flow and emission both are nouns.

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

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

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

flow: the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
emission: any of several bodily processes by which substances go out of the body

Other hypernyms of flow include discharge, expelling.

flow (noun)	emission (noun)
the act of flowing or streaming; continuous progression	the act of emitting; causing to flow forth
the motion characteristic of fluids (liquids or gases)	the occurrence of a flow of water (as from a pipe)
dominant course (suggestive of running water) of successive events or ideas	the release of electrons from parent atoms
any uninterrupted stream or discharge	any of several bodily processes by which substances go out of the body
the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause	a substance that is emitted or released
something that resembles a flowing stream in moving continuously
the amount of fluid that flows in a given time

flow (verb)	emission (verb)
undergo menstruation
cover or swamp with water
fall or flow in a certain way
move along, of liquids
move or progress freely as if in a stream
cause to flow
be abundantly present