ischium vs bone

ischium and bone both are nouns.

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

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

Other hypernyms of ischium include os.

ischium (noun)	bone (noun)
one of the three sections of the hipbone; situated below the ilium	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

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

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