genu varum vs disability

genu varum and disability both are nouns.

Word	Noun	Adjective	Verb	Adverb
genu varum	Yes	No	No	No
disability	Yes	No	No	No

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

genu varum: 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 genu varum include leg, disablement, handicap, impairment.

genu varum (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