impotence vs weakness

impotence and weakness both are nouns.

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

As nouns, weakness is a hyponym of impotence; that is, weakness is a word with a more specific, narrower meaning than impotence:

impotence (noun)	weakness (noun)
the quality of lacking strength or power; being weak and feeble	the property of lacking physical or mental strength; liability to failure under pressure or stress or strain
an inability (usually of the male animal) to copulate	powerlessness revealed by an inability to act
	a penchant for something even though it might not be good for you
	a flaw or weak point
	the condition of being financially weak