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.
solider slider solder soldier solidary soldiery slatier siltier sledder saltier slitter sleetier solitary slittier sluttier solitaire salter slater saltire saluter slotter zoolater sultry
collider glider solider slider wilder guiltier welder colluder alder siltier lieder fielder vaultier gelder aulder joltier liter shoulder lidar balder golder maltier milder molder moulder older politer solder colder wielder guilder killdeer deluder caldera welldoer soldier bowlder bouldery boulder builder elder eluder bolder faultier shielder blader wieldier holder folder melder miltier moldier mouldier polder saltier gilder lader yielder
solidi solid slid sold slide sloid soldi soldo soled