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.
fort forte forty forrit frat frit ford fart fret fiord fruit fordo fritt foredo fretty ferity fruity ferret ferrate ferrite ferrety phorate vert fard farad fared fired fraud freed fried vertu virtu
bort fort mort ort port sort tort whort wort short