highbrow vs intellectual

highbrow and intellectual both are nouns.

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

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

Other hypernyms of highbrow include intellect.

highbrow (noun)	intellectual (noun)
a person of intellectual or erudite tastes	a person who uses the mind creatively

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