respiratory center vs bulb

respiratory center and bulb both are nouns.

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

respiratory center (noun)	bulb (noun)
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	electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity
	a rounded part of a cylindrical instrument (usually at one end)
	a rounded dilation or expansion in a canal or vessel or organ
	lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)
	a modified bud consisting of a thickened globular underground stem serving as a reproductive structure
	anything with a round shape resembling a teardrop