sphenoid bone vs bone

sphenoid bone and bone both are nouns.

Word	Noun	Adjective	Verb	Adverb
sphenoid bone	Yes	No	No	No
bone	Yes	Yes	Yes	No

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

Other hypernyms of sphenoid bone include os.

sphenoid bone (noun)	bone (noun)
butterfly-shaped bone at the base of the skull	a shade of white the color of bleached bones
	rigid connective tissue that makes up the skeleton of vertebrates
	the porous calcified substance from which bones are made

sphenoid bone (adjective)	bone (adjective)
	consisting of or made up of bone

sphenoid bone (verb)	bone (verb)
	remove the bones from
	study intensively, as before an exam