read-only memory vs fixed storage

read-only memory and fixed storage both are nouns.

Word	Noun	Adjective	Verb	Adverb
read-only memory	Yes	No	No	No
fixed storage	Yes	No	No	No

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

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

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

read-only memory (noun)	fixed storage (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