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.
gloater clatter clouter gladder glitter gladier glittery guiltier clattery gleetier gauleiter colter golder kelter glider kilter clutter coulter quilter cloture clowder guilder cloudier coleader cloddier collator cluttery colder kultur caldera culture
bloater gloater floater blotter falter platter plater palter balloter floatier blatter elater allotter alter clouter bolter plotter relater salter slatier zoolater bleater lotter violater molter realter reloader latter looter pleater platier loader plaiter slotter slater loiter colter jolter clatter halter flouter later flatter dilater