scepticism vs doubt

scepticism and doubt both are nouns.

Word	Noun	Adjective	Verb	Adverb
scepticism	Yes	No	No	No
doubt	Yes	No	Yes	No

As nouns, doubt is a hypernym of scepticism; that is, doubt is a word with a broader meaning than scepticism:

Other hypernyms of scepticism include doubtfulness, dubiety, dubiousness, incertitude, uncertainty.

scepticism (noun)	doubt (noun)
the disbelief in any claims of ultimate knowledge	uncertainty about the truth or factuality or existence of something
doubt about the truth of something	the state of being unsure of something

scepticism (verb)	doubt (verb)
	consider unlikely
	lack confidence in