read-only memory vs memory

read-only memory and memory both are nouns.

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

As nouns, memory is a hypernym of read-only memory; that is, memory is a word with a broader meaning than read-only memory:

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

Other hypernyms of read-only memory include computer memory, computer storage, memory board, storage, store.

read-only memory (noun)	memory (noun)
(computer science) memory whose contents can be accessed and read but cannot be changed	an electronic memory device
	the power of retaining and recalling past experience
	the cognitive processes whereby past experience is remembered
	something that is remembered
	the area of cognitive psychology that studies memory processes