helplessness vs powerlessness

helplessness and powerlessness both are nouns.

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

As nouns, powerlessness is a hypernym of helplessness; that is, powerlessness is a word with a broader meaning than helplessness:

helplessness: powerlessness revealed by an inability to act
powerlessness: the quality of lacking strength or power; being weak and feeble

Other hypernyms of helplessness include impotence, impotency.

helplessness (noun)	powerlessness (noun)
powerlessness revealed by an inability to act	the quality of lacking strength or power; being weak and feeble
a feeling of being unable to manage
the state of needing help from something