leg bone vs calf bone

leg bone and calf bone both are nouns.

Word	Noun	Adjective	Verb	Adverb
leg bone	Yes	No	No	No
calf bone	Yes	No	No	No

As nouns, calf bone is a hyponym of leg bone; that is, calf bone is a word with a more specific, narrower meaning than leg bone:

leg bone: a bone of the leg
calf bone: the outer and thinner of the two bones of the human leg between the knee and ankle

Other hyponyms of leg bone include femoris, femur, thighbone, fibula, shin, shin bone, shinbone, tibia.

leg bone (noun)	calf bone (noun)
a bone of the leg	the outer and thinner of the two bones of the human leg between the knee and ankle