technical grade vs chemistry

technical grade is not a noun while chemistry is a noun.

Word	Noun	Adjective	Verb	Adverb
technical grade	No	Yes	No	No
chemistry	Yes	No	No	No

technical grade (noun)	chemistry (noun)
	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
	the way two individuals relate to each other
	the chemical composition and properties of a substance or object

technical grade (adjective)	chemistry (adjective)
containing small amounts of other chemicals, hence slightly impure