disbelief vs skepticism

disbelief and skepticism both are nouns.

Word	Noun	Adjective	Verb	Adverb
disbelief	Yes	No	No	No
skepticism	Yes	No	No	No

As nouns, disbelief and skepticism are synonyms defined as:

Other synonyms of disbelief include incredulity, mental rejection, scepticism.

As nouns, skepticism is a hyponym of disbelief; that is, skepticism is a word with a more specific, narrower meaning than disbelief:

Other hyponyms of disbelief include agnosticism, scepticism, atheism.

disbelief (noun)	skepticism (noun)
doubt about the truth of something	doubt about the truth of something
a rejection of belief	the disbelief in any claims of ultimate knowledge