leading vs superior

leading and superior both are nouns.

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

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

leading (adjective)	superior (adjective)
going or proceeding or going in advance; showing the way	written or printed above and to one side of another character
greatest in importance or degree or significance or achievement	of or characteristic of high rank or importance
having the leading position or higher score in a contest	of high or superior quality or performance
indicating the most important performer or role	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