action
background
blue
circle
circular
clean
current
curve
cyclone
deep
depth
downward
drain
environment
falling
flow
fluid
force
hole
lake
motion
nature
odd
pool
ripple
river
round
sea
spin
spiral
stream
surge
swift
swirl
turbulent
turning
twist
twisted
volume
vortex
water
wave
whirl
whirlpool
whirpool