acronym vs initialism

acronym and initialism both are nouns.

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

As nouns, acronym and initialism are synonyms defined as:

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

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