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.
greaser greasier creaser creasier grassier grazer gorsier grosser grazier grouser crasser caresser grocer curser cuirassier courser crosier grocery cruiser crazier coarser crosser kreuzer carouser curiouser crozer cursor corsair crozier cursory
creaser greaser dresser praiser raiser raser brasier eraser foreseer verser harasser hoarser caresser coarser crasser creasier greasier parser presser terser
grease greasy crease creasy gores grass grassy grays grees greys grues egress ogres ogress