napkin vs sex activity

napkin and sex activity both are nouns.

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

napkin (noun)	sex 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
garment consisting of a folded cloth drawn up between the legs and fastened at the waist; worn by infants to catch excrement