Single MOSFET Amplifiers
For the BJT, the "common collector" configuration is called an emitter follower. This has current gain, but no voltage gain. The emitter sits at 0.7V (PN Junction) below the base voltage. The voltage gain of this circuit is just below 1, and the current gain is equal to the beta of the transistor.

The same thing happens with "common drain" - also called "source follower". The source of the FET sits at a voltage which is the turn-on voltage below the gate voltage. Because the turn-on voltage of the FET changes with current level, this circuit has voltage gain slightly less than 1, and which reduces as the current level increases.