ostracize vs blackball

ostracize is not a noun while blackball is a noun.

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

As verbs, ostracize and blackball are synonyms defined as:

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

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

ostracize (verb)	blackball (verb)
avoid speaking to or dealing with	expel from a community or group
expel from a community or group	vote against; refuse to endorse; refuse to assent