intermarriage vs intermarry

intermarriage is a noun but intermarry is not a noun.

Word	Noun	Adjective	Verb	Adverb
intermarriage	Yes	No	No	No
intermarry	No	No	Yes	No

intermarriage (noun)	intermarry (noun)
marriage within one's own tribe or group as required by custom or law
marriage to a person belonging to a tribe or group other than your own as required by custom or law

intermarriage (verb)	intermarry (verb)
	marry within the same ethnic, social, or family group