sceptic vs intellectual

sceptic and intellectual both are nouns.

Word	Noun	Adjective	Verb	Adverb
sceptic	Yes	No	No	No
intellectual	Yes	Yes	No	No

As nouns, intellectual is a hypernym of sceptic; that is, intellectual is a word with a broader meaning than sceptic:

Other hypernyms of sceptic include intellect.

sceptic (noun)	intellectual (noun)
someone who habitually doubts accepted beliefs	a person who uses the mind creatively

sceptic (adjective)	intellectual (adjective)
	appealing to or using the intellect
	involving intelligence rather than emotions or instinct
	of or associated with or requiring the use of the mind