bow-tie vs black tie

bow-tie and black tie both are nouns.

Word	Noun	Adjective	Verb	Adverb
bow-tie	Yes	No	No	No
black tie	Yes	No	No	No

As nouns, black tie is a hyponym of bow-tie; that is, black tie is a word with a more specific, narrower meaning than bow-tie:

Other hyponyms of bow-tie include white tie.

bow-tie (noun)	black tie (noun)
a man's tie that ties in a bow	a black bow tie worn with a dinner jacket
	semiformal evening dress for men