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.
drowns drones diurons durions darns durns trones tronas drains turions dryness durians dearness direness dourines dourness terns turns tarns trans triens ternes trains treens trines tureens trienes triunes trounce durance terrains terrenes terreens trueness terrines trannies trainees tourneys terranes taurines
frowns drowns crowns browns tronas roans virions herons neurons morrions morns marrons kroons frons crones turions porns heroins barons pereions perrons prawns pyrones diurons brawns horns groans morions pereons drones carrions borons prions croons maroons hyperons neurones coronas trones sorns durions morons girons gyrons groins irons garrons corns irones chorions