chemical science vs nitrate

chemical science and nitrate both are nouns.

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

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

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