grouping vs abstract entity

grouping and abstract entity both are nouns.

Word	Noun	Adjective	Verb	Adverb
grouping	Yes	No	No	No
abstract entity	Yes	No	No	No

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

grouping: any number of entities (members) considered as a unit
abstract entity: a general concept formed by extracting common features from specific examples

Other hypernyms of grouping include abstraction.

grouping (noun)	abstract entity (noun)
any number of entities (members) considered as a unit	a general concept formed by extracting common features from specific examples
the activity of putting things together in groups
a system for classifying things into groups