chemical science vs breakdown

chemical science and breakdown both are nouns.

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

chemical science (noun)	breakdown (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 disrupting an established order so it fails to continue
	an analysis into mutually exclusive categories
	a cessation of normal operation
	(biology) the process of decay caused by bacterial or fungal action
	(chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance
	a mental or physical breakdown