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.
haughtiest headiest hootiest haddest hottest hoodiest hadst headstay
haughtiest doughtiest goutiest rootiest poutiest pettiest nuttiest knottiest cattiest bittiest nettiest fattiest footiest hootiest jettiest whitest wittiest chutist battiest sootiest doughiest peatiest dotiest guttiest dottiest zootiest ruttiest pottiest matiest nittiest rattiest nattiest gnattiest mitiest meatiest tattiest whitiest chattiest shittiest test