plural form vs stacks

plural form and stacks both are nouns.

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

plural form (noun)	stacks (noun)
the form of a word that is used to denote more than one	storage space in a library consisting of an extensive arrangement of bookshelves where most of the books are stored
	a large number or amount