cortex vs medulla

cortex and medulla both are nouns.

Word	Noun	Adjective	Verb	Adverb
cortex	Yes	No	No	No
medulla	Yes	No	No	No

cortex (noun)	medulla (noun)
the tissue forming the outer layer of an organ or structure in plant or animal	the inner part of an organ or structure in plant or animal
the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum	lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)
the tissue that surrounds the lens nucleus	a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers