congratulation vs plural

congratulation and plural both are nouns.

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

congratulation (noun)	plural (noun)
the act of acknowledging that someone has an occasion for celebration	the form of a word that is used to denote more than one
(usually plural) an expression of pleasure at the success or good fortune of another

congratulation (adjective)	plural (adjective)
	grammatical number category referring to two or more items or units
	composed of more than one member, set, or kind