Outlet. A point on the wiring system at which current is taken to supply utilization equipment. (CMP-1)
Receptacle. A contact device installed at the outlet for the connection of an attachment plug, or for the direct connection of electrical utilization equipment designed to mate with the corresponding contact device. A single receptacle is a single contact device with no other contact device on the same yoke or strap. A multiple receptacle is two or more contact devices on the same yoke or strap. (CMP-18)
Informational Note: A duplex receptacle is an example of a multiple receptacle that has two receptacles on the same yoke or strap.
Receptacle Outlet. An outlet where one or more receptacles are installed. (CMP-18)
210.8 (A) Dwelling Units
All 125-volt through 250-volt receptacles installed in the locations specified in 210.8(A)(1) through (A)(11) and supplied by single-phase branch circuits rated 150 volts or less to ground shall have ground-fault circuit-interrupter protection for personnel.
1. Bathrooms
7. Sinks — where receptacles are installed within 1.8 m (6 ft) from the top inside edge of the bowl of the sink
I suppose anyone could argue this either way, the way I read the definitions an edison base socket is a receptacle. Within a bathroom or 6 feet of a sink, it needs GFCI protection.
I'll get my popcorn...