nymphomaniac vs sexual activity

nymphomaniac and sexual activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
nymphomaniac	Yes	Yes	No	No
sexual activity	Yes	No	No	No

nymphomaniac (noun)	sexual activity (noun)
a woman with abnormal sexual desires	activities associated with sexual intercourse

nymphomaniac (adjective)	sexual activity (adjective)
(used of women) affected with excessive sexual desire