palatine bone vs os

palatine bone and os both are nouns.

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

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

palatine bone: either of two irregularly shaped bones that form the back of the hard palate and helps to form the nasal cavity and the floor of the orbits
os: rigid connective tissue that makes up the skeleton of vertebrates

Other hypernyms of palatine bone include bone.

palatine bone (noun)	os (noun)
either of two irregularly shaped bones that form the back of the hard palate and helps to form the nasal cavity and the floor of the orbits	rigid connective tissue that makes up the skeleton of vertebrates
	a mouth or mouthlike opening