acronym vs signifier

acronym and signifier both are nouns.

Word	Noun	Adjective	Verb	Adverb
acronym	Yes	No	No	No
signifier	Yes	No	No	No

As nouns, signifier is a hypernym of acronym; that is, signifier is a word with a broader meaning than acronym:

acronym: a word formed from the initial letters of the several words in the name and pronounced as one word
signifier: the phonological or orthographic sound or appearance of a word that can be used to describe or identify something

Other hypernyms of acronym include descriptor, form, word form.

acronym (noun)	signifier (noun)
a word formed from the initial letters of the several words in the name and pronounced as one word	the phonological or orthographic sound or appearance of a word that can be used to describe or identify something