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.
collop clop calliope gallop clap clip glop callipee clepe culpa galop clypei culpae gloppy calipee
gallop dollop lollop shallop collop wallop lop lollopy loop slope bloop sloop elope pullup fillip galop flop loup jalop plop jalopy saloop clop slop lope glop
collie colly col cool cully coly cull cole cowl cola cooly coil coolie coala coaly coal callow callee calla call coolly coulee coyly cullay golly