magnetic core vs read/write memory

magnetic core and read/write memory both are nouns.

Word	Noun	Adjective	Verb	Adverb
magnetic core	Yes	No	No	No
read/write memory	Yes	No	No	No

magnetic core (noun)	read/write memory (noun)
(computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories	the most common computer memory which can be used by programs to perform necessary tasks while the computer is on; an integrated circuit memory chip allows information to be stored or accessed in any order and all storage locations are equally accessible