chemical science vs stoichiometry

chemical science and stoichiometry both are nouns.

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

chemical science (noun)	stoichiometry (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	(chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers)