wheelie -- Accelerating the drive wheel enough that the front wheel comes up.
                Can be maintained for long distances, if you can get the vehicle to a standing balance point, and then use very small adjustments to keep it balanced.
                Often done by accelerating from a stop, but can be done from a running start as well.

manual -- riding a wheelie at the balance point without pedaling (bicycle only, I assume?)

stoppie / endo -- a "reverse wheelie" done by applying the brakes hard while at speed.  Can be ridden at the balance point like wheelies.