visual defect vs disablement

visual defect and disablement both are nouns.

Word	Noun	Adjective	Verb	Adverb
visual defect	Yes	No	No	No
disablement	Yes	No	No	No

As nouns, disablement is a hypernym of visual defect; that is, disablement is a word with a broader meaning than visual defect:

visual defect: impairment of the sense of sight
disablement: the condition of being unable to perform as a consequence of physical or mental unfitness

Other hypernyms of visual defect include disability, handicap, impairment.

visual defect (noun)	disablement (noun)
impairment of the sense of sight	the condition of being unable to perform as a consequence of physical or mental unfitness