disk space vs swap file

disk space and swap file both are nouns.

Word	Noun	Adjective	Verb	Adverb
disk space	Yes	No	No	No
swap file	Yes	No	No	No

As nouns, swap file is a hyponym of disk space; that is, swap file is a word with a more specific, narrower meaning than disk space:

Other hyponyms of disk space include disk overhead, overhead, swap space.

disk space (noun)	swap file (noun)
(computer science) the space available on a magnetic disk	the disk space that is set aside for virtual memory