tibia vara vs disability

tibia vara and disability both are nouns.

Word	Noun	Adjective	Verb	Adverb
tibia vara	Yes	No	No	No
disability	Yes	No	No	No

As nouns, disability is a hypernym of tibia vara; that is, disability is a word with a broader meaning than tibia vara:

tibia vara: a leg bowed outward at the knee (or below the knee)
disability: the condition of being unable to perform as a consequence of physical or mental unfitness

Other hypernyms of tibia vara include leg, disablement, handicap, impairment.

tibia vara (noun)	disability (noun)
a leg bowed outward at the knee (or below the knee)	the condition of being unable to perform as a consequence of physical or mental unfitness