chemical science vs scavenge

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

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

chemical science (noun)	scavenge (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)	scavenge (verb)
	remove unwanted substances from
	feed on carrion or refuse
	clean refuse from
	collect discarded material