chemical science vs sequester

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

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

chemical science (noun)	sequester (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)	sequester (verb)
	keep away from others
	set apart from others
	undergo sequestration by forming a stable compound with an ion
	take temporary possession of as a security, by legal authority
	requisition forcibly, as of enemy property