ousting vs dethronement

ousting and dethronement both are nouns.

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

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

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

Other hyponyms of ousting include deposition.

ousting (noun)	dethronement (noun)
the act of ejecting someone or forcing them out	the act of deposing someone; removing a powerful person from a position or office