bigamist vs married person

bigamist and married person both are nouns.

Word	Noun	Adjective	Verb	Adverb
bigamist	Yes	No	No	No
married person	Yes	No	No	No

As nouns, married person is a hypernym of bigamist; that is, married person is a word with a broader meaning than bigamist:

bigamist: someone who marries one person while already legally married to another
married person: a person's partner in marriage

Other hypernyms of bigamist include better half, mate, partner, spouse.

bigamist (noun)	married person (noun)
someone who marries one person while already legally married to another	a person's partner in marriage