sex activity vs table napkin

sex activity and table napkin both are nouns.

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

sex 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