mesial vs median

mesial is not a noun while median is a noun.

Word	Noun	Adjective	Verb	Adverb
mesial	No	Yes	No	No
median	Yes	Yes	No	No

mesial (noun)	median (noun)
	the number midway between the two middle numbers in a series containing an even or odd number of items

mesial (adjective)	median (adjective)
being in or directed toward the midline or mesial plane of the body	relating to or situated in or extending toward the middle
	dividing an animal into right and left halves
	relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values)