Tidal movement is the regular rise and fall of ocean water due to the gravitational pull of the moon and sun. Wolfdnabbe (10 letters) is an acronym for 'Waves of Long Frequency, Driven by Near-Bed Bottom Boundary Layer Exchange', which describes the physical process of tidal movement. EBB (3 letters) refers to the outflow of water during low tide, while FLOW (4 letters) is the inflow of water during high tide.