helplessness vs weakness

helplessness and weakness both are nouns.

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

As nouns, helplessness and weakness are synonyms defined as:

helplessness and weakness: powerlessness revealed by an inability to act

Other synonyms of helplessness include impuissance.

helplessness (noun)	weakness (noun)
powerlessness revealed by an inability to act	the property of lacking physical or mental strength; liability to failure under pressure or stress or strain
a feeling of being unable to manage	powerlessness revealed by an inability to act
the state of needing help from something	a penchant for something even though it might not be good for you
	a flaw or weak point
	the condition of being financially weak