carpal vs os triquetrum

carpal and os triquetrum both are nouns.

Word	Noun	Adjective	Verb	Adverb
carpal	Yes	Yes	No	No
os triquetrum	Yes	No	No	No

As nouns, os triquetrum is a hyponym of carpal; that is, os triquetrum is a word with a more specific, narrower meaning than carpal:

carpal: any of the eight small bones of the wrist of primates
os triquetrum: a wrist bone that articulates with the pisiform and hamate and lunate bones

carpal (noun)	os triquetrum (noun)
any of the eight small bones of the wrist of primates	a wrist bone that articulates with the pisiform and hamate and lunate bones

carpal (adjective)	os triquetrum (adjective)
of or relating to the wrist