Diplomatic service and Foreign service

Diplomatic service noun - The body of diplomatic personnel.

Foreign service and diplomatic service are semantically related in office for foreign relations topic. In some cases you can use "Foreign service" instead a noun phrase "Diplomatic service".

Foreign service noun - The part of the State Department that supplies diplomats for the United States embassies and consulates around the world.

Diplomatic service and foreign service are semantically related in diplomatic staff topic. You can use "Diplomatic service" instead a noun phrase "Foreign service".