release vs activity

release and activity both are nouns.

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

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

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

release: a process that liberates or discharges something
activity: a process existing in or produced by nature (rather than by the intent of human beings)

Other hypernyms of release include action, natural action, natural process.

release (noun)	activity (noun)
activity that frees or expresses creative energy or emotion	any specific behavior
the act of liberating someone or something	the trait of being active; moving or acting rapidly and energetically
the termination of someone's employment (leaving them free to depart)	an organic process that takes place in the body
the act of allowing a fluid to escape	a process existing in or produced by nature (rather than by the intent of human beings)
a formal written statement of relinquishment	the state of being active
(music) the act or manner of terminating a musical phrase or tone	(chemistry) the capacity of a substance to take part in a chemical reaction
merchandise issued for sale or public showing (especially a record or film)
a device that when pressed will release part of a mechanism
an announcement distributed to members of the press in order to supplement or replace an oral presentation
a legal document evidencing the discharge of a debt or obligation
euphemistic expressions for death
a process that liberates or discharges something

release (verb)	activity (verb)
generate and separate from cells or bodily fluids
eliminate (a substance)
make (assets) available
prepare and issue for public distribution or sale
release, as from one's grip
let (something) fall or spill from a container
release (gas or energy) as a result of a chemical reaction or physical decomposition
part with a possession or right
grant freedom to; free from confinement
make (information) available for publication