molecule vs group

molecule and group both are nouns.

Word	Noun	Adjective	Verb	Adverb
molecule	Yes	No	No	No
group	Yes	No	Yes	No

molecule (noun)	group (noun)
(physics and chemistry) the simplest structural unit of an element or compound	any number of entities (members) considered as a unit
(nontechnical usage) a tiny piece of anything	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

molecule (verb)	group (verb)
	arrange into a group or groups
	form a group or group together