sew vs stitch

sew is not a noun while stitch is a noun.

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

As verbs, sew and stitch are synonyms defined as:

Other synonyms of sew include run up, sew together.

sew (noun)	stitch (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

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