Intermarriage as a noun is a marriage between people belonging to different groups, ethnic, religious or otherwise. while Endogamy as a noun is the practice of marrying or requiring to marry within one's own ethnic, religious, or social group.
Part of speech: noun
Definition: a marriage between people belonging to different groups, ethnic, religious or otherwise.
Part of speech: noun
Definition: The practice of marrying or requiring to marry within one's own ethnic, religious, or social group.
We hope you now know whether to use Intermarriage or Endogamy in your sentence.