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.
fleets filets fillets flits flats felts faults valets flytes floats flutes flatus flotas flites flouts fluyts violets flautas folates foliates fellates fealties fallouts filiates volts folds fields faulds vaults voltes floods felids fluids velleities valutas velites volutes fluidise fluidize valuates veloutes violates
leets fleets gleets sleets quillets delts culets filets bullets felts blets kelts bluets cleats gelts violets lets willets wallets gledes boletus melts muletas owlets pallets pelts pleats relets celts boletes piolets bleeds bleats killdees toilets sallets galletas fillets pullets mullets palets mallets millets billets collets rillets deletes welts pellets gullets gleeds gallets callets cullets howlets valets allottees ballets belts chalets
fleet filed filet fled flied flued leveled levelled