fibula vs calf bone

fibula and calf bone both are nouns.

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

As nouns, fibula and calf bone are synonyms defined as:

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

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