pisiform bone vs wrist bone

pisiform bone and wrist bone both are nouns.

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

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

Other hypernyms of pisiform bone include carpal, carpal bone.

pisiform bone (noun)	wrist bone (noun)
a small wrist bone that articulates only with the triquetral	any of the eight small bones of the wrist of primates