bow legs vs disability

bow legs and disability both are nouns.

Word	Noun	Adjective	Verb	Adverb
bow legs	Yes	No	No	No
disability	Yes	No	No	No

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

bow legs: outward curvature of the legs
disability: the condition of being unable to perform as a consequence of physical or mental unfitness

Other hypernyms of bow legs include disablement, handicap, impairment.

bow legs (noun)	disability (noun)
outward curvature of the legs	the condition of being unable to perform as a consequence of physical or mental unfitness