plural vs rudiments

plural and rudiments both are nouns.

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

plural (noun)	rudiments (noun)
the form of a word that is used to denote more than one	the elementary stages of any subject (usually plural)
	a statement of fundamental facts or principles

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