frailty vs feebleness

frailty and feebleness both are nouns.

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

As nouns, frailty and feebleness are synonyms defined as:

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

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

frailty (noun)	feebleness (noun)
moral weakness	the quality of lacking intensity or substance
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)