ROM vs read-only memory

ROM and read-only memory both are nouns.

Word	Noun	Adjective	Verb	Adverb
ROM	Yes	No	No	No
read-only memory	Yes	No	No	No

As nouns, ROM and read-only memory are synonyms defined as:

ROM and read-only memory: (computer science) memory whose contents can be accessed and read but cannot be changed

Other synonyms of ROM include fixed storage, read-only storage.

ROM (noun)	read-only memory (noun)
(computer science) memory whose contents can be accessed and read but cannot be changed	(computer science) memory whose contents can be accessed and read but cannot be changed