chemical science vs semisynthetic

chemical science is a noun but semisynthetic is not a noun.

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

chemical science (noun)	semisynthetic (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions

chemical science (adjective)	semisynthetic (adjective)
	not of natural origin; prepared or made artificially