medulla vs myelin

medulla and myelin both are nouns.

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

As nouns, medulla and myelin are synonyms defined as:

medulla and myelin: a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers

Other synonyms of medulla include myeline.

medulla (noun)	myelin (noun)
the inner part of an organ or structure in plant or animal	a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
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