chemical science vs desorb

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

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

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

chemical science (verb)	desorb (verb)
	go away from the surface to which (a substance) is adsorbed
	remove from a surface on which it is adsorbed