bowtie vs bow-tie

bowtie and bow-tie both are nouns.

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

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

Other synonyms of bowtie include bow tie.

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