initialism vs acronym

initialism and acronym both are nouns.

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

As nouns, initialism and acronym are synonyms defined as:

initialism and acronym: a word formed from the initial letters of the several words in the name and pronounced as one word

initialism (noun)	acronym (noun)
an abbreviation formed from the initial letters of the several words in the name and pronounced separately	a word formed from the initial letters of the several words in the name and pronounced as one word
a word formed from the initial letters of the several words in the name and pronounced as one word