storage space vs cache

storage space and cache both are nouns.

Word	Noun	Adjective	Verb	Adverb
storage space	Yes	No	No	No
cache	Yes	No	Yes	No

As nouns, cache is a hyponym of storage space; that is, cache is a word with a more specific, narrower meaning than storage space:

Other hyponyms of storage space include cellar, wine cellar, closet, cupboard, drawer, cellar, root cellar, stacks.

storage space (noun)	cache (noun)
the area in any structure that provides space for storage	a hidden storage space (for money or provisions or weapons)
	(computer science) RAM memory that is set aside as a specialized buffer storage that is continually updated; used to optimize data transfers between system elements with different characteristics
	a secret store of valuables or money

storage space (verb)	cache (verb)
	save up as for future use