excellent vs fantabulous

excellent and fantabulous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
excellent	No	Yes	No	No
fantabulous	No	Yes	No	No

As adjectives, excellent and fantabulous are synonyms defined as:

Other synonyms of excellent include first-class, mean, ripping, splendid.

excellent (adjective)	fantabulous (adjective)
very good; of the highest quality	very good; of the highest quality