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.
downs dons donas towns dawns donsy donnas donees donsie dens townees tons donnees dans townies dins duns dense dynes toons dinos tones dunes dines denes tonus deans denies tonnes dienes danios tauons toonies duennas tawnies dueness dunness tawneys deionize dinghies tonneaus tans tens tins tuns
gowns knowns owns towns downs ons minnows loons coons loins moans johns coins pons cons bones eons pions fohns nones roans conns fons awns monas enows jones neons dons yawns wins wens phonos tonus sons tones peones dawns koans mons lions zones phons snows cones bonus muons onus boons cions pawns phones goons paeons conus sones wyns sonsy lawns leones joins nouns poons fawns hons hones scions quoins kaons foins ions hysons onos aeons moons nows noons ones peons pones monos loans knows donas zoons nonas donsy tauons tons toons wans winnows wons yonis
down downy don dawn dona done donee donna donne donnee town townee townie towny adown udon