intelligence agency vs intelligence service

intelligence agency and intelligence service both are nouns.

Word	Noun	Adjective	Verb	Adverb
intelligence agency	Yes	No	No	No
intelligence service	Yes	No	No	No

As nouns, intelligence agency and intelligence service are synonyms defined as:

intelligence agency and intelligence service: a unit responsible for gathering and interpreting information about an enemy

Other synonyms of intelligence agency include intelligence.

intelligence agency (noun)	intelligence service (noun)
a unit responsible for gathering and interpreting information about an enemy	a unit responsible for gathering and interpreting information about an enemy