excellent vs splendid

excellent and splendid both are adjectives.

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

As adjectives, excellent and splendid are synonyms defined as:

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

excellent (adjective)	splendid (adjective)
very good; of the highest quality	having great beauty and splendor
	characterized by grandeur
	very good; of the highest quality