The following ranks are all obtainable via in-game money.
/fix all
/speed (fly speed only)
/fix
/bannermaker
/fly
/nick (color)
/skull
/nick (without color)
/ptime (controls the time for yourself)
/back on death/enderchest
/anvil
/pweather/back
/craft/condense
/trash or /disposal
/ah