impotence vs powerlessness

impotence and powerlessness both are nouns.

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

As nouns, impotence and powerlessness are synonyms defined as:

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

Other synonyms of impotence include impotency.

impotence (noun)	powerlessness (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