Inundation rhymes with:
commendation, fundacion, recommendation, commendation, foundation, fundacion, recommendation, accommodation, backwardation, commendation, consolidation, degradation, depredation, fluoridation, foundation, fundacion, gradation, intimidation, invalidation, liquidation, oxidation, predation, recommendation, retardation, sedation, trepidation, validation
Inundation sounds like:
ianthina, imitation, indian, indiana, indianian, indium, initiation, intan, intone, intuition