chemical science vs break up

chemical science is a noun but break up is not a noun.

Word	Noun	Adjective	Verb	Adverb
chemical science	Yes	No	No	No
break up	No	No	Yes	No

chemical science (noun)	break up (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)	break up (verb)
	laugh unrestrainedly
	break or cause to break into pieces
	come to an end
	separate (substances) into constituent elements or parts
	cause to go into a solution
	cause to separate
	close at the end of a session
	bring the association of to an end or cause to break up
	make a break in
	set or keep apart
	break violently or noisily; smash
	attack with or as if with a pickaxe of ice or rocky ground, for example
	release ice
	destroy the completeness of a set of related items
	take apart into its constituent pieces
	suffer a nervous breakdown
	disband
	to cause to separate and go in different directions
	discontinue an association or relation; go different ways