skepticism vs disbelief

skepticism and disbelief both are nouns.

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

As nouns, skepticism and disbelief are synonyms defined as:

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

As nouns, disbelief is a hypernym of skepticism; that is, disbelief is a word with a broader meaning than skepticism:

Other hypernyms of skepticism include unbelief.

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