bow tie vs bow-tie

bow tie and bow-tie both are nouns.

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

As nouns, bow tie and bow-tie are synonyms defined as:

Other synonyms of bow tie include bowtie.

bow tie (noun)	bow-tie (noun)
a man's tie that ties in a bow	a man's tie that ties in a bow