sexual activity vs premature ejaculation

sexual activity and premature ejaculation both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexual activity	Yes	No	No	No
premature ejaculation	Yes	No	No	No

sexual activity (noun)	premature ejaculation (noun)
activities associated with sexual intercourse	ejaculation during the early stages of sexual excitement or soon after the insertion of the penis into the vagina