bow leg vs tibia vara

bow leg and tibia vara both are nouns.

Word	Noun	Adjective	Verb	Adverb
bow leg	Yes	No	No	No
tibia vara	Yes	No	No	No

As nouns, bow leg and tibia vara are synonyms defined as:

bow leg and tibia vara: a leg bowed outward at the knee (or below the knee)

Other synonyms of bow leg include bandy leg, bandyleg, bowleg, genu varum.

bow leg (noun)	tibia vara (noun)
a leg bowed outward at the knee (or below the knee)	a leg bowed outward at the knee (or below the knee)
outward curvature of the legs