I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
caresser crasser creaser crosser coarser carouser creasier curser greaser courser grosser crosier cuirassier cruiser greasier grassier crosshair curiouser crozer cursor crazier crozier cursory gorsier grouser kreuzer cruzeiro grazer grocer
caresser presser dresser tressier drossier creaser prissier pressor grosser greaser grassier crosser cuirassier harasser verser foreseer brassier dressier reissuer terser crasser trusser
caress cares cars scares cures carassow caries carrs carse coarse cores crease cress cressy crews cries creasy acres creese scars