buffer store vs random-access memory

buffer store and random-access memory both are nouns.

Word	Noun	Adjective	Verb	Adverb
buffer store	Yes	No	No	No
random-access memory	Yes	No	No	No

buffer store (noun)	random-access memory (noun)
(computer science) a part of RAM used for temporary storage of data that is waiting to be sent to a device; used to compensate for differences in the rate of flow of data between components of a computer system	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