fashion vs sew

fashion is a noun but sew is not a noun.

Word	Noun	Adjective	Verb	Adverb
fashion	Yes	No	Yes	No
sew	No	No	Yes	No

As verbs, sew is a hyponym of fashion; that is, sew is a word with a more specific, narrower meaning than fashion:

Other hyponyms of fashion include tie, craft, tailor-make, tailor.

fashion (noun)	sew (noun)
characteristic or habitual practice
consumer goods (especially clothing) in the current mode
how something is done or how it happens
the latest and most admired style in clothes and cosmetics and behavior

fashion (verb)	sew (verb)
make out of components (often in an improvising manner)	fasten by sewing; do needlework
	create (clothes) with cloth