blackball vs banish

blackball is a noun but banish is not a noun.

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

As verbs, blackball and banish are synonyms defined as:

Other synonyms of blackball include ban, cast out, ostracise, ostracize, shun.

blackball (noun)	banish (noun)
the act of excluding someone by a negative vote or veto

blackball (verb)	banish (verb)
expel from a community or group	drive away
vote against; refuse to endorse; refuse to assent	expel, as if by official decree
	expel from a community or group
	ban from a place of residence, as for punishment