medullated vs medulla

medullated is not a noun while medulla is a noun.

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

medullated (noun)	medulla (noun)
	the inner part of an organ or structure in plant or animal
	lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)
	a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers

medullated (adjective)	medulla (adjective)
(of neurons) covered with a layer of myelin