leg bone vs tibia

leg bone and tibia both are nouns.

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

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

leg bone: a bone of the leg
tibia: the inner and thicker of the two bones of the human leg between the knee and ankle

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

leg bone (noun)	tibia (noun)
a bone of the leg	the inner and thicker of the two bones of the human leg between the knee and ankle