riding breeches vs plural form

riding breeches and plural form both are nouns.

Word	Noun	Adjective	Verb	Adverb
riding breeches	Yes	No	No	No
plural form	Yes	No	No	No

riding breeches (noun)	plural form (noun)
(used in the plural) flared trousers ending at the calves; worn with riding boots	the form of a word that is used to denote more than one