grouping vs activity

grouping and activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
grouping	Yes	No	No	No
activity	Yes	No	No	No

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

grouping (noun)	activity (noun)
any number of entities (members) considered as a unit	any specific behavior
the activity of putting things together in groups	the trait of being active; moving or acting rapidly and energetically
a system for classifying things into groups	an organic process that takes place in the body
	a process existing in or produced by nature (rather than by the intent of human beings)
	the state of being active
	(chemistry) the capacity of a substance to take part in a chemical reaction