chemical science vs rectification

chemical science and rectification both are nouns.

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

chemical science (noun)	rectification (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	the act of offering an improvement to replace a mistake; setting right
	determination of the length of a curve; finding a straight line equal in length to a given curve
	the conversion of alternating current to direct current
	(chemistry) the process of refinement or purification of a substance by distillation