ouster vs eviction

ouster and eviction both are nouns.

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

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

ouster: a wrongful dispossession
eviction: the expulsion of someone (such as a tenant) from the possession of land by process of law

Other hypernyms of ouster include dispossession, legal ouster.

ouster (noun)	eviction (noun)
the act of ejecting someone or forcing them out	the expulsion of someone (such as a tenant) from the possession of land by process of law
a wrongful dispossession	action by a landlord that compels a tenant to leave the premises (as by rendering the premises unfit for occupancy); no physical expulsion or legal process is involved
a person who ousts or supplants someone else