emission vs ejaculation

emission and ejaculation both are nouns.

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

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

emission: any of several bodily processes by which substances go out of the body
ejaculation: the discharge of semen in males

emission (noun)	ejaculation (noun)
the act of emitting; causing to flow forth	an abrupt emphatic exclamation expressing emotion
the occurrence of a flow of water (as from a pipe)	the discharge of semen in males
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