Fluctuate rhymes with:
perpetuate, perpetuate, actuate, antiquate, braithwaite, counterweight, cowperthwaite, deadweight, featherweight, garthwaite, goldthwaite, heavyweight, hundredweight, menstruate, middleweight, paperweight, perpetuate, underweight, welterweight
Fluctuate sounds like:
falgoust, falgout, falsehood, falsetto, falsity, felicetti, felicitate, felicite, felicity, filched, filegate, flaccid, flagday, flagged, flashed, flashiest, flaxseed, fleeced, fleshed, flexed, flight, flighty, flocked, fluctuated, flushed, full-sized, fullest