decomposition vs chemical science

decomposition and chemical science both are nouns.

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

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