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.
neatest nattiest nettiest gnattiest neediest nittiest nuttiest knottiest nudest nudist
featest latest neatest test phattest guttiest matiest haughtiest mitiest hootiest nattiest coattest knottiest nettiest nuttiest quietest pettiest hottest poutiest retest ruttiest zootiest detest dottiest tattiest wattest whatsit whitiest chattiest gnattiest fattiest jettiest nittiest footiest cutest fattest bittiest battiest attest mutest testa testy cattiest fittest meatiest peatiest goutiest pottiest rattiest rootiest sootiest deadest dotiest doughtiest tautest wettest whitest wittiest shittiest