mean and superior both are nouns.

mean and superior both are adjectives.

mean is a verb but superior is not a verb.

mean (noun)	superior (noun)
an average of n numbers computed by adding some function of the numbers and dividing by some function of n	one of greater rank or station or quality
	the head of a religious community
	a combatant who is able to defeat rivals
	a character or symbol set or printed or written above and immediately to one side of another character

mean (adjective)	superior (adjective)
approximating the statistical norm or average or expected value	of high or superior quality or performance
characterized by malice	of or characteristic of high rank or importance
having or showing an ignoble lack of honor or morality	written or printed above and to one side of another character
marked by poverty befitting a beggar	having an orbit farther from the sun than the Earth's orbit
(used of persons or behavior) characterized by or indicative of lack of generosity	(sometimes followed by `to') not subject to or influenced by
(used of sums of money) so small in amount as to deserve contempt	having a higher rank
of no value or worth	(often followed by `to') above being affected or influenced by
very good; of the highest quality

mean (verb)	superior (verb)
mean or intend to express or convey
have as a logical consequence
denote or connote
have in mind as a purpose
have a specified degree of importance
intend to refer to
destine or designate for a certain purpose