chemical science vs group

chemical science and group both are nouns.

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

chemical science (noun)	group (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	any number of entities (members) considered as a unit
	a set that is closed, associative, has an identity element and every element has an inverse
	(chemistry) two or more atoms bound together as a single unit and forming part of a molecule

chemical science (verb)	group (verb)
	arrange into a group or groups
	form a group or group together