read-only storage vs ROM

read-only storage and ROM both are nouns.

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

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

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

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

read-only storage (noun)	ROM (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