superior vs splendid

superior is a noun but splendid is not a noun.

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

superior (noun)	splendid (noun)
a character or symbol set or printed or written above and immediately to one side of another character
one of greater rank or station or quality
the head of a religious community
a combatant who is able to defeat rivals

superior (adjective)	splendid (adjective)
written or printed above and to one side of another character	having great beauty and splendor
of or characteristic of high rank or importance	characterized by grandeur
of high or superior quality or performance	very good; of the highest quality
having an orbit farther from the sun than the Earth's orbit
(sometimes followed by `to') not subject to or influenced by
having a higher rank
(often followed by `to') above being affected or influenced by