read-only memory vs store

read-only memory and store both are nouns.

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

As nouns, store is a hypernym of read-only memory; that is, store 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
store: an electronic memory device

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

read-only memory (noun)	store (noun)
(computer science) memory whose contents can be accessed and read but cannot be changed	a mercantile establishment for the retail sale of goods or services
	a depository for goods
	an electronic memory device
	a supply of something available for future use

read-only memory (verb)	store (verb)
	keep or lay aside for future use
	find a place for and put away for storage