plural form vs descriptor

plural form and descriptor both are nouns.

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

As nouns, descriptor is a hypernym of plural form; that is, descriptor is a word with a broader meaning than plural form:

plural form: the form of a word that is used to denote more than one
descriptor: the phonological or orthographic sound or appearance of a word that can be used to describe or identify something

Other hypernyms of plural form include form, signifier, word form.

plural form (noun)	descriptor (noun)
the form of a word that is used to denote more than one	a piece of stored information that is used to identify an item in an information storage and retrieval system
	the phonological or orthographic sound or appearance of a word that can be used to describe or identify something