General delivery and Social unit

General delivery noun - The part of a post office that handles mail for persons who call for it.

Social unit and general delivery are semantically related. In some cases you can use "Social unit" instead a noun phrase "General delivery".

Social unit noun - An organization regarded as part of a larger social group.

General delivery and social unit are semantically related. Sometimes you can replace phrase "General delivery" with "Social unit", this phrases are similar.