breakdown vs chemical science

breakdown and chemical science both are nouns.

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

breakdown (noun)	chemical science (noun)
the act of disrupting an established order so it fails to continue	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
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