median vs central

median and central both are nouns.

median (noun)	central (noun)
the number midway between the two middle numbers in a series containing an even or odd number of items	a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication

median (adjective)	central (adjective)
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)	in or near a center or constituting a center; the inner area
dividing an animal into right and left halves	serving as an essential component
relating to or situated in or extending toward the middle