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.
flatter flattery flutter floater flitter fluttery floatier fluter filter falter flytier fleeter flutier flouter violater faultier filature fellator folder fielder flooder philter vaulter valuator vaultier violator philtre vulture
latter clatter blatter platter flatter allotter flitter floatier fluttery halter blotter later flattery litter falter glitter clattery violater bleater plotter realter reletter slater slitter slotter zoolater palter elater plater plaiter letter floater lottery flutter lotter alter bloater cluttery blottier glittery littery gloater clutter platier pleater plottier relater salter slatier slittier sluttier dilater
flat flauta float floaty folate