sew vs gather

sew is not a noun while gather is a noun.

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

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

sew (noun)	gather (noun)
	the act of gathering something
	sewing consisting of small folds or puckers made by pulling tight a thread in a line of stitching

sew (verb)	gather (verb)
fasten by sewing; do needlework	increase in amount by collecting or gathering
create (clothes) with cloth	increase or develop
	conclude from evidence
	assemble or get together
	draw together into folds or puckers
	look for (food) in nature
	draw and bring closer
	collect in one place
	get people together