bowtie vs necktie

bowtie and necktie both are nouns.

Word	Noun	Adjective	Verb	Adverb
bowtie	Yes	No	No	No
necktie	Yes	No	No	No

As nouns, necktie is a hypernym of bowtie; that is, necktie is a word with a broader meaning than bowtie:

bowtie: a man's tie that ties in a bow
necktie: neckwear consisting of a long narrow piece of material worn (mostly by men) under a collar and tied in knot at the front

Other hypernyms of bowtie include tie.

bowtie (noun)	necktie (noun)
a man's tie that ties in a bow	neckwear consisting of a long narrow piece of material worn (mostly by men) under a collar and tied in knot at the front