nitrate vs chemical science

nitrate and chemical science both are nouns.

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

nitrate (noun)	chemical science (noun)
any compound containing the nitrate group (such as a salt or ester of nitric acid)	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions

nitrate (verb)	chemical science (verb)
treat with nitric acid, so as to change an organic compound into a nitrate