Random repetitions?

The easiest way to generate random repetitions is to use a particle system. CC Particle word will let you choose a Textured Square as a particle source and then choose a layer. Change the Producer Size and the physics and you can turn a layer (text layer or movie) into a particle and end up with this in about a minute.

You could even animate the text generating a different word on each frame and choose Birth as the texture time and end up with a bunch of different words randomly popping up in the comp. The timeline shows you everything I did in this comp to create the comp.