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.
fret fretty ferret frit fart frat fort ferrety forte freed fired fared fruit fried forty fritt furred ferity feared forrit faired fruity foredo ferrate ferried ferrite variety fard ford vert farad fiord fordo fraud vertu virtu
ret barret beret buret ferret fret caret curet garret terret tret turret