Counterintelligence and Intelligence service

Counterintelligence noun - Intelligence activities concerned with identifying and counteracting the threat to security posed by hostile intelligence organizations or by individuals engaged in espionage or sabotage or subversion or terrorism.

Intelligence service and counterintelligence are semantically related. In some cases you can use "Intelligence service" instead a noun "Counterintelligence".

Intelligence service noun - A unit responsible for gathering and interpreting information about an enemy.

Counterintelligence and intelligence service are semantically related. You can use "Counterintelligence" instead a noun phrase "Intelligence service".