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.
filets fillets fleets violets flats flits felts filiates flouts flutes flatus flotas fluyts valets flytes fields flites faults floats flautas folates fellates violates foliates fealties fallouts volts folds velleities felids voltes faulds vaults floods fluids valutas velites volutes fluidise fluidize valuates veloutes
ballets filets quillets callets palets gullets toilets piolets sallets pallets bullets billets blets owlets culets howlets cullets willets valets violets gallets collets fillets pellets lets millets relets mullets mallets pullets wallets chalets rillets gleets jilts lats poults bleats guilts cultus plots kilts delts gilts deletes blots silts milts halts vaults reallots slots tallits deltas tilts shallots blats slits celts jolts flats cleats pleats quilts kelts zealots bluets belts fleets lots lilts galletas gleds sleds sleets bolts pelts leets gelts muletas flits hilts slats boletes melts moults faults dolts colts malts molts rialtos ballots clots helots gluts boletus volts sluts voltes alts cults salts allots plats maillots felts pilots holts naleds saults gaults altos lits tildes welts wilts childes sheltas
filed filet failed field filiate filled fillet fled fleet flied flued foiled afield