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.
guest gust quest gusto gusty cuesta gusset guessed gooiest gast keyset guised coesite gaseity gazette gussied cast cost kist
guest quest least beset besot gusto bust gusty gust doughiest gooiest lust best jest gest hest vesta beast hygeist wrest dusty oust shiest chest reset weest testa neist reest zesty pesto deist rest must rust cesta siesta just suety busty fusty joust hygieist geste geest heist faucet lusty dust fiesta fest feist feast east suet cuesta lest vest wriest test zooiest zest cesti rusty musty roust doest pesty resat pest nest testy west resit chesty yeast
guess cues gaes gauss goes guise gussie gussy guys kues agues ukes