incidental vs plural

incidental and plural both are nouns.

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

incidental (noun)	plural (noun)
an item that is incidental	the form of a word that is used to denote more than one
(frequently plural) an expense not budgeted or not specified

incidental (adjective)	plural (adjective)
(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence	grammatical number category referring to two or more items or units
not of prime or central importance	composed of more than one member, set, or kind
occurring with or following as a consequence