stitch vs sew

stitch is a noun but sew is not a noun.

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

As verbs, stitch and sew are synonyms defined as:

Other synonyms of stitch include run up, sew together.

stitch (noun)	sew (noun)
a link or loop or knot made by an implement in knitting, crocheting, embroidery, or sewing
a sharp spasm of pain in the side resulting from running

stitch (verb)	sew (verb)
fasten by sewing; do needlework	fasten by sewing; do needlework
	create (clothes) with cloth