intelligence activity vs intelligence operation

intelligence activity and intelligence operation both are nouns.

Word	Noun	Adjective	Verb	Adverb
intelligence activity	Yes	No	No	No
intelligence operation	Yes	No	No	No

As nouns, intelligence activity and intelligence operation are synonyms defined as:

intelligence activity and intelligence operation: the operation of gathering information about an enemy

Other synonyms of intelligence activity include intelligence.

intelligence activity (noun)	intelligence operation (noun)
the operation of gathering information about an enemy	the operation of gathering information about an enemy