fab vs fabulous

fab and fabulous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fab	No	Yes	No	No
fabulous	No	Yes	No	No

As adjectives, fab and fabulous are synonyms defined as:

fab (adjective)	fabulous (adjective)
extremely pleasing	barely credible
	extremely pleasing
	based on or told of in traditional stories; lacking factual basis or historical validity