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.
graces grazes greases grasses graecize curacies gracious gracioso gorses cruces crazes crases coriaceous grecize crazies grouses carices coerces creases grosses grazioso griseous grosz cuirasses corses crozes cruses carses krises crasis grosze curses groszy crises crosses cruises coryzas courses creeses kerseys cresses caresses carouses karosses
hyraces races terraces traces braces boraces graces truces crazes recess cruces pierces murices rosacea forces varices precess piracies mercies process hydrases arrases coerces phrases rices gyrases whereases farcies ureases orrices brazes trices boreases grazes rases curacies greases erases razes tierces crases urases creases prases prices sources terces terrases merces carices farces charases
grace grass grassy grays graze grease greasy rackers