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.
gusto gust guest gusty gusset gast quest cuesta guised gaseity gooiest guessed gussied cast cost kist
gusto just dust cestoi rust pistou oust must lusty lust quest gusty gust guest joust stoa fusty busty bust bestow stow musty pesto roust rusty xystoi dusty
gauss guess guise gussie gussy guys