ejection vs ousting

ejection and ousting both are nouns.

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

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

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

ejection (noun)	ousting (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