ejection vs ouster

ejection and ouster both are nouns.

Word	Noun	Adjective	Verb	Adverb
ejection	Yes	No	No	No
ouster	Yes	No	No	No

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

Other hyponyms of ejection include defenestration, deportation, ostracism, barring, blackball, ousting.

ejection (noun)	ouster (noun)
the act of forcing out someone or something	the act of ejecting someone or forcing them out
the act of expelling or projecting or ejecting	a wrongful dispossession
	a person who ousts or supplants someone else