superior vs leading

superior and leading both are nouns.

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

superior (noun)	leading (noun)
a character or symbol set or printed or written above and immediately to one side of another character	thin strip of metal used to separate lines of type in printing
one of greater rank or station or quality	the activity of leading
the head of a religious community
a combatant who is able to defeat rivals

superior (adjective)	leading (adjective)
written or printed above and to one side of another character	going or proceeding or going in advance; showing the way
of or characteristic of high rank or importance	greatest in importance or degree or significance or achievement
of high or superior quality or performance	having the leading position or higher score in a contest
having an orbit farther from the sun than the Earth's orbit	indicating the most important performer or role
(sometimes followed by `to') not subject to or influenced by
having a higher rank
(often followed by `to') above being affected or influenced by