Dedication: 3/15/05

fluo, fluxum: flow; fluctus: wave; flumen: river; fluvius: river

affluence, affluent, afflux, circumfluent, circumfluous, confluence, confluent, confluently, conflux, contrafluxion, counterinfluence, defluvium, defluxion, diffluan, diffluence, diffluent, dulcifluous, effluence, effluent, effluve, effluvia, effluvial, effluvient, effluvious, effluvium, efflux, effluxion, flu, fluate, flucatcher, fluctiferous, fluctifragous, fluctisonant, fluctivagous, fluctuant, fluctuate, fluctuation, fluency, fluent, fluently, fluid, fluidics, fluidism, fluidity, fluidize, fluidization, fluidly, flume, flourescence, flourescent, flouridate, flouridation, fluoride, fluorination, fluorine, fluorocarbon, fluoroform, fluorometer, fluorophore, fluoroscope, fluoroscopic, fluorosis, fluorotype, flush (card trick), fluvial, fluviatile, fluvicoline, fluviology, fluviomarine, fluviometer, fluvioterrestrial, flux, fluxion, fluxional, glacifluvial, hydrofluoric, influence, influent, influential, influentially, influenza, influx, interfluve, Koblenz, lactifluous, magnaflux, mellifluence, mellifluent, mellifluous, mellifluously, multifluvian, outflux, overfluent, perfluent, perfluorinate, profluence, profluent, profluvium, refluence, refluent, reflux, semifluid, septemfluous, soliflual, solifluction, superfluid, superfluidity, superfluity, superfluous, superfluously, superflux, Teflon, transfluence, transfluent, transfluvial, transfluxor, uninfluenced, uninfluential, writing fluid

N.B. Flow is not derived from fluo.
focus: hearth, fireplace

afocal, bifocal, cacafuego, confocal, contrafocal, contrafocus, curfew, defocus, electrofocusing, epifocal, focal, focalization, focalize, focimeter, focoid, focus, focusable, foyer, fuel, fuelless, fusil, fusillade, hyperfocal, locofoco, matrifocal, multifocal, multifuel, nuclear fuel, omnifocal, parfocal, parfocalize, patrifocal, prefocus, refocus, refuel, short focus, soft focus, solid fuel, synfuel, trifocal, unfocused, varifocal