powerlessness vs impotence

powerlessness and impotence both are nouns.

Word	Noun	Adjective	Verb	Adverb
powerlessness	Yes	No	No	No
impotence	Yes	No	No	No

As nouns, powerlessness and impotence are synonyms defined as:

powerlessness and impotence: the quality of lacking strength or power; being weak and feeble

Other synonyms of powerlessness include impotency.

powerlessness (noun)	impotence (noun)
the quality of lacking strength or power; being weak and feeble	the quality of lacking strength or power; being weak and feeble
	an inability (usually of the male animal) to copulate