bow-tie vs bowtie

bow-tie and bowtie both are nouns.

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

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

Other synonyms of bow-tie include bow tie.

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