plural vs knockout drops

plural and knockout drops both are nouns.

Word	Noun	Adjective	Verb	Adverb
plural	Yes	Yes	No	No
knockout drops	Yes	No	No	No

plural (noun)	knockout drops (noun)
the form of a word that is used to denote more than one	chloral hydrate in combination with alcohol; usually administered surreptitiously to make the drinker unconscious

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