stitch vs cast on

stitch is a noun but cast on is not a noun.

Word	Noun	Adjective	Verb	Adverb
stitch	Yes	No	Yes	No
cast on	No	No	Yes	No

As verbs, cast on is a hyponym of stitch; that is, cast on is a word with a more specific, narrower meaning than stitch:

stitch (noun)	cast on (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)	cast on (verb)
fasten by sewing; do needlework	make the first row of stitches when knitting