biological group vs group

biological group and group both are nouns.

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

As nouns, group is a hypernym of biological group; that is, group is a word with a broader meaning than biological group:

Other hypernyms of biological group include grouping.

biological group (noun)	group (noun)
a group of plants or animals	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

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