ROM vs store

ROM and store both are nouns.

Word	Noun	Adjective	Verb	Adverb
ROM	Yes	No	No	No
store	Yes	No	Yes	No

As nouns, store is a hypernym of ROM; that is, store is a word with a broader meaning than ROM:

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

Other hypernyms of ROM include computer memory, computer storage, memory, memory board, storage.

ROM (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

ROM (verb)	store (verb)
	keep or lay aside for future use
	find a place for and put away for storage