Fontaine rhymes with:
buntain, contain, fountaine, lafountain, lafountaine, lamontagne, maintain, abstain, aquitaine, ascertain, attain, brattain, buntain, butane, chastain, contain, costain, detain, entertain, fountaine, lafountain, lafountaine, lamontagne, maintain, mustain, obtain, partain, pertain, petain, retain, sartain, stain, sustain, uptain
Fontaine sounds like:
fantini, fanton, fenton, finton, fontana, foundation, fountain, fountaine, funtime