fixed storage vs read-only memory

fixed storage and read-only memory both are nouns.

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

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

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

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

fixed storage (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