patchwork vs stitchery

patchwork and stitchery both are nouns.

Word	Noun	Adjective	Verb	Adverb
patchwork	Yes	No	No	No
stitchery	Yes	No	No	No

As nouns, stitchery is a hypernym of patchwork; that is, stitchery is a word with a broader meaning than patchwork:

patchwork: sewing consisting of pieces of different materials sewn together in a pattern
stitchery: needlework on which you are working with needle and thread

Other hypernyms of patchwork include sewing.

patchwork (noun)	stitchery (noun)
sewing consisting of pieces of different materials sewn together in a pattern	needlework on which you are working with needle and thread
a quilt made by sewing patches of different materials together
a theory or argument made up of miscellaneous or incongruous ideas