ouster vs ejector

ouster and ejector both are nouns.

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

As nouns, ouster and ejector are synonyms defined as:

ouster (noun)	ejector (noun)
the act of ejecting someone or forcing them out	a mechanism in a firearm that ejects the empty shell case after firing
a wrongful dispossession	An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump.
a person who ousts or supplants someone else	a person who ousts or supplants someone else