endogamy vs intermarriage

endogamy and intermarriage both are nouns.

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

As nouns, endogamy and intermarriage are synonyms defined as:

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

Other synonyms of endogamy include inmarriage.

endogamy (noun)	intermarriage (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