houselights vs plural form

houselights and plural form both are nouns.

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

houselights (noun)	plural form (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