feebleness vs frailty

feebleness and frailty both are nouns.

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

As nouns, feebleness and frailty are synonyms defined as:

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

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

feebleness (noun)	frailty (noun)
the quality of lacking intensity or substance	moral weakness
the state of being weak in health or body (especially from old age)	the state of being weak in health or body (especially from old age)