chemical science vs decomposition

chemical science and decomposition both are nouns.

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

chemical science (noun)	decomposition (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	the analysis of a vector field
	the organic phenomenon of rotting
	(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
	in a decomposed state