rudiments vs plural form

rudiments and plural form both are nouns.

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

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