stitch vs cast off

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

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

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

stitch (noun)	cast off (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 off (verb)
fasten by sewing; do needlework	to remove
	make the last row of stitches when knitting