accelerator vs chemical science

accelerator and chemical science both are nouns.

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

accelerator (noun)	chemical science (noun)
a valve that regulates the supply of fuel to the engine	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
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