biological group vs grouping

biological group and grouping both are nouns.

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

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

Other hypernyms of biological group include group.

biological group (noun)	grouping (noun)
a group of plants or animals	any number of entities (members) considered as a unit
	the activity of putting things together in groups
	a system for classifying things into groups