endogamy vs inmarriage

endogamy and inmarriage both are nouns.

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

As nouns, endogamy and inmarriage are synonyms defined as:

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

Other synonyms of endogamy include intermarriage.

endogamy (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