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.
guilt guilty quilt gault guild guiled gullet kilt quillet cult glut culti gleet culet kilty glout gloat glute galoot gallet glutei gleety galiot gulled cullet kiltie quality gallate quilled galette gullied culotte galloot galatea galliot quailed galeate galleta clot colt glad gled gold kelt
built guilt quilt toilet silty sault pilot milty lilt guild vault kilty guilty build fault faulty filet vaulty culti hilt gault milt kilt moult gilt poult jilt silt culet tilt cult wilt
guile gul gaily gull gulley gully quill quillai quillaia guaiacol