limbers vs plural form

limbers and plural form both are nouns.

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

limbers (noun)	plural form (noun)
a channel or gutter on either side of a ship's keelson; carries bilge water into the pump well	the form of a word that is used to denote more than one