Charybdis, Maelstrom, back stream, backcountry, backflow, backlash, backwater, backwoods, boondocks, bush, clout, condensation trail, contrail, countercurrent, counterflow, counterflux, eddy, exhaust, force, gulf, gurge, hinterland, impact, impress, impression, imprint, maelstrom, mark, print, reaction, recoil, reflex, refluence, reflux, regurgitation, repercussion, response, sticks, stream, swirl, track, twirl, up-country, vapor trail, vortex, wake, wash, whirl, whirlpool