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.
gusty gust guest gusto gusset gaseity gast quest cuesta guised gooiest guessed gussied cast cost kist
busty lusty rusty musty dusty gusty fusty sty vasty guest lust rust joust feisty russety stey must roust dust piosity nasty chesty pasty gusto quest gust just tasty pesty wristy suety oust stay testy hasty misty zesty ghosty toasty bust yeasty
gauss guess guise gussie gussy guys