scepticism vs incertitude

scepticism and incertitude both are nouns.

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

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

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

scepticism (noun)	incertitude (noun)
the disbelief in any claims of ultimate knowledge	the state of being unsure of something
doubt about the truth of something