infirmity vs frailty

infirmity and frailty both are nouns.

Word	Noun	Adjective	Verb	Adverb
infirmity	Yes	No	No	No
frailty	Yes	No	No	No

As nouns, infirmity and frailty are synonyms defined as:

infirmity and frailty: the state of being weak in health or body (especially from old age)

Other synonyms of infirmity include debility, feebleness, frailness, valetudinarianism.

infirmity (noun)	frailty (noun)
the state of being weak in health or body (especially from old age)	moral weakness
	the state of being weak in health or body (especially from old age)