impuissance vs helplessness

impuissance and helplessness both are nouns.

Word	Noun	Adjective	Verb	Adverb
impuissance	Yes	No	No	No
helplessness	Yes	No	No	No

As nouns, impuissance and helplessness are synonyms defined as:

impuissance and helplessness: powerlessness revealed by an inability to act

Other synonyms of impuissance include weakness.

impuissance (noun)	helplessness (noun)
powerlessness revealed by an inability to act	powerlessness revealed by an inability to act
	a feeling of being unable to manage
	the state of needing help from something