calf vs mid-calf

calf and mid-calf both are nouns.

Word	Noun	Adjective	Verb	Adverb
calf	Yes	No	No	No
mid-calf	Yes	No	No	No

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

calf (noun)	mid-calf (noun)
young of domestic cattle	the middle of the calf; half way between the knee and ankle
young of various large placental mammals e.g. whale or giraffe or elephant or buffalo
the muscular back part of the shank
fine leather from the skin of a calf