scratchpad vs computer storage

scratchpad and computer storage both are nouns.

Word	Noun	Adjective	Verb	Adverb
scratchpad	Yes	No	No	No
computer storage	Yes	No	No	No

As nouns, computer storage is a hypernym of scratchpad; that is, computer storage is a word with a broader meaning than scratchpad:

scratchpad: (computer science) a high-speed internal memory used for temporary storage of preliminary information
computer storage: an electronic memory device

Other hypernyms of scratchpad include computer memory, memory, memory board, storage, store.

scratchpad (noun)	computer storage (noun)
(computer science) a high-speed internal memory used for temporary storage of preliminary information	an electronic memory device