dethronement vs ouster

dethronement and ouster both are nouns.

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

As nouns, ouster is a hypernym of dethronement; that is, ouster is a word with a broader meaning than dethronement:

dethronement: the act of deposing someone; removing a powerful person from a position or office
ouster: the act of ejecting someone or forcing them out

Other hypernyms of dethronement include ousting.

dethronement (noun)	ouster (noun)
the act of deposing someone; removing a powerful person from a position or office	the act of ejecting someone or forcing them out
	a wrongful dispossession
	a person who ousts or supplants someone else