houselights vs plural

houselights and plural both are nouns.

Word	Noun	Adjective	Verb	Adverb
houselights	Yes	No	No	No
plural	Yes	Yes	No	No

houselights (noun)	plural (noun)
lights that illuminate the audience's part of a theater or other auditorium	the form of a word that is used to denote more than one

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