group vs molecule

group and molecule both are nouns.

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

group (noun)	molecule (noun)
any number of entities (members) considered as a unit	(physics and chemistry) the simplest structural unit of an element or compound
a set that is closed, associative, has an identity element and every element has an inverse	(nontechnical usage) a tiny piece of anything
(chemistry) two or more atoms bound together as a single unit and forming part of a molecule

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