medulla vs respiratory center

medulla and respiratory center both are nouns.

Word	Noun	Adjective	Verb	Adverb
medulla	Yes	No	No	No
respiratory center	Yes	No	No	No

medulla (noun)	respiratory center (noun)
the inner part of an organ or structure in plant or animal	the center in the medulla oblongata and pons that integrates sensory information about the level of oxygen and carbon dioxide in the blood and determines the signals to be sent to the respiratory muscles
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