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.
siddur sadder stir seder cider sutra sitar stour sudor stair stoury sudary seeder suiter sitter souter stoure suitor satire suture sautoir seedier sootier stourie sautoire
siddur bidder rudder redder odour maduro nodder kidder gadder codder ladder judder fodder widder wadder chuddar tedder shedder bedder budder dour madder dodder sadder ridder padder mudder odder dure duro dura durr adder badder cheddar wedder chudder udder shudder
said side sidh soddy sudd aside