chemical science vs iodinating

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

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

chemical science (noun)	iodinating (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)	iodinating (adjective)
	combining or causing to combine with iodine