central vs medial

central is a noun but medial is not a noun.

Word	Noun	Adjective	Verb	Adverb
central	Yes	Yes	No	No
medial	No	Yes	No	No

central (noun)	medial (noun)
a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication

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