topside vs plural form

topside and plural form both are nouns.

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

topside (noun)	plural form (noun)
(usually plural) weather deck; the part of a ship's hull that is above the waterline	the form of a word that is used to denote more than one