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.
radius radios rads roadies readies roads reads raids redias readds raitas riotous rowdies roadeos rats ruts reds rods rids rites ratos rudds routs rodes redds roods rates riots redos reeds rotis writs redes rotas rides reatas reduce reties retuse riatas rodeos routes writes redoes
medius radius dis situs boodies medusa roadies coitus medias bawdies cedis teddies wadis readies toddies gaudies iodous dits eddies fuddies bodies bidis audios woodies waddies tidies dowdies daddies iodise kudus adieus caddis laddies midis beedies kadis muddies nidus nodous nudies paddies radios giddies biddies gaddis soddies cadis adios diss dues vodous cuddies howdies buddies hoodies dies didies foodies gadis ladies baddies goodies caddies redias dais rowdies qadis duos odious sadis neddies noddies kiddies middies padis nodus duds tedious toadies modus todies wadies doodies widdies shoddies
radii radio rad trade rarity krait grad raid raita read readd ready redia rediae braid irade road grade roadeo orad roadie trad brad trait