plural form vs signifier

plural form and signifier both are nouns.

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

As nouns, signifier is a hypernym of plural form; that is, signifier 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
signifier: 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 descriptor, form, word form.

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