blackball vs ejection

blackball and ejection both are nouns.

Word	Noun	Adjective	Verb	Adverb
blackball	Yes	No	Yes	No
ejection	Yes	No	No	No

As nouns, ejection is a hypernym of blackball; that is, ejection is a word with a broader meaning than blackball:

Other hypernyms of blackball include exclusion, expulsion, riddance.

blackball (noun)	ejection (noun)
the act of excluding someone by a negative vote or veto	the act of forcing out someone or something
	the act of expelling or projecting or ejecting

blackball (verb)	ejection (verb)
expel from a community or group
vote against; refuse to endorse; refuse to assent