tail bone vs bone

tail bone and bone both are nouns.

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

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

Other hypernyms of tail bone include os.

tail bone (noun)	bone (noun)
the end of the vertebral column in humans and tailless apes	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

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

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