chemical science vs accelerator

chemical science and accelerator both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemical science	Yes	No	No	No
accelerator	Yes	No	No	No

chemical science (noun)	accelerator (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	a valve that regulates the supply of fuel to the engine
	a scientific instrument that increases the kinetic energy of charged particles
	a pedal that controls the throttle valve
	(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected