impotency vs powerlessness

impotency and powerlessness both are nouns.

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

As nouns, impotency and powerlessness are synonyms defined as:

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

Other synonyms of impotency include impotence.

impotency (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