table napkin vs sexual activity

table napkin and sexual activity both are nouns.

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

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