wrist bone vs os

wrist bone and os both are nouns.

Word	Noun	Adjective	Verb	Adverb
wrist bone	Yes	No	No	No
os	Yes	No	No	No

As nouns, os is a hypernym of wrist bone; that is, os is a word with a broader meaning than wrist bone:

Other hypernyms of wrist bone include bone.

wrist bone (noun)	os (noun)
any of the eight small bones of the wrist of primates	rigid connective tissue that makes up the skeleton of vertebrates
	a mouth or mouthlike opening