sexual activity vs table napkin

sexual activity and table napkin both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexual activity	Yes	No	No	No
table napkin	Yes	No	No	No

sexual activity (noun)	table napkin (noun)
activities associated with sexual intercourse	a small piece of table linen that is used to wipe the mouth and to cover the lap in order to protect clothing