ouster vs doer

ouster and doer both are nouns.

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

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

Other hypernyms of ouster include actor, worker.

ouster (noun)	doer (noun)
the act of ejecting someone or forcing them out	a person who acts and gets things done
a wrongful dispossession
a person who ousts or supplants someone else