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.
fillets filets fleets violets flats felts fellates fallouts flits filiates valets fields flytes flutes floats flouts flotas flatus flites faults fluyts velleities flautas folates fealties foliates violates volts phyllites folds phyllodes faulds felids floods fluids vaults voltes valutas velites volutes
ballets willets gullets mullets billets quillets fillets gallets pallets mallets pellets sallets rillets pullets millets collets wallets cullets bullets callets lets maillots galletas boletes piolets relets allots bluets violets culets filets fleets blets chalets reallots valets cleats boletus sleets howlets tallits owlets pleats ballots lilts leets deletes bleats palets muletas toilets gleets shallots
filled fillet failed felled filed filet foiled fulled