inmarriage vs marriage

inmarriage and marriage both are nouns.

Word	Noun	Adjective	Verb	Adverb
inmarriage	Yes	No	No	No
marriage	Yes	No	No	No

As nouns, marriage is a hypernym of inmarriage; that is, marriage is a word with a broader meaning than inmarriage:

inmarriage: marriage within one's own tribe or group as required by custom or law
marriage: the state of being a married couple voluntarily joined for life (or until divorce)

Other hypernyms of inmarriage include matrimony, spousal relationship, union, wedlock.

inmarriage (noun)	marriage (noun)
marriage within one's own tribe or group as required by custom or law	the act of marrying; the nuptial ceremony
	two people who are married to each other
	the state of being a married couple voluntarily joined for life (or until divorce)
	a close and intimate union