bone vs os

bone and os both are nouns.

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

As nouns, bone and os are synonyms defined as:

bone and os: rigid connective tissue that makes up the skeleton of vertebrates

bone (noun)	os (noun)
a shade of white the color of bleached bones	rigid connective tissue that makes up the skeleton of vertebrates
rigid connective tissue that makes up the skeleton of vertebrates	a mouth or mouthlike opening
the porous calcified substance from which bones are made

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

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