sexual practice vs impotence

sexual practice and impotence both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexual practice	Yes	No	No	No
impotence	Yes	No	No	No

sexual practice (noun)	impotence (noun)
activities associated with sexual intercourse	the quality of lacking strength or power; being weak and feeble
	an inability (usually of the male animal) to copulate