pigeon toes vs disability

pigeon toes and disability both are nouns.

Word	Noun	Adjective	Verb	Adverb
pigeon toes	Yes	No	No	No
disability	Yes	No	No	No

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

pigeon toes: disability in which the toes are turned inward; often associated with knock-knee
disability: the condition of being unable to perform as a consequence of physical or mental unfitness

Other hypernyms of pigeon toes include disablement, handicap, impairment.

pigeon toes (noun)	disability (noun)
disability in which the toes are turned inward; often associated with knock-knee	the condition of being unable to perform as a consequence of physical or mental unfitness