plural vs bath salts

plural and bath salts both are nouns.

Word	Noun	Adjective	Verb	Adverb
plural	Yes	Yes	No	No
bath salts	Yes	No	No	No

plural (noun)	bath salts (noun)
the form of a word that is used to denote more than one	a preparation that softens or scents a bath

plural (adjective)	bath salts (adjective)
grammatical number category referring to two or more items or units
composed of more than one member, set, or kind