biotic community vs grouping

biotic community and grouping both are nouns.

Word	Noun	Adjective	Verb	Adverb
biotic community	Yes	No	No	No
grouping	Yes	No	No	No

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

biotic community: (ecology) a group of interdependent organisms inhabiting the same region and interacting with each other
grouping: any number of entities (members) considered as a unit

Other hypernyms of biotic community include group.

biotic community (noun)	grouping (noun)
(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other	any number of entities (members) considered as a unit
	the activity of putting things together in groups
	a system for classifying things into groups