intermarriage vs inmarriage

intermarriage and inmarriage both are nouns.

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

As nouns, intermarriage and inmarriage are synonyms defined as:

intermarriage and inmarriage: marriage within one's own tribe or group as required by custom or law

Other synonyms of intermarriage include endogamy.

intermarriage (noun)	inmarriage (noun)
marriage within one's own tribe or group as required by custom or law	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