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.
flats flatus floats folates flautas flits felts foliates filiates fellates filets flites flotas flutes faults flytes fleets fluyts flouts fillets violates valuates fallouts fealties volts folds fields faulds voltes floods valets vaults felids fluids valutas velites violets volutes fluidise veloutes phyllites
lats flats slats blats plats clots palets alts allots pelts felts folates elates lets valets volts balatas platys glads mullets halts slates gaults moults colts maleates poults gelatos cullets lots violets collets gilts relets jolts vaults saults piolets palates rialtos slits chelates welts toluates plaits tilts delts pellets dolts sallets gloats zealots sluts helots shallots wilts oleates filiates clads melts pilots altos pallets bolts reallots gallates delates rillets kelts faults alates bloats lads gelates salts quilts ballads milts jilts pullets cults gluts culets gallets guilts holts malts lilts ballots salads mallets celts blots fellates fillets bleats callets ballets cultus millets cleats filets howlets foliates eluates collates belts quillets malates lits flatus pleats maillots ciliates gelts voltes hilts gelatis blets wallets molts violates silts kilts billets gullets palliates bullets solates willets dealates floats valuates plots relates owlets flits slots plates deltas dilates tallits toilets chalets cholates sheltas
flat felt flauta flit flite float floaty flota flute flutey fluty flyte folate