chemical science vs ligate

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

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

chemical science (noun)	ligate (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)	ligate (verb)
	bind with a bandage or ligature
	bind chemically
	join letters in a ligature when writing