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.
widest whitest weediest whitiest wittiest woodiest wadset wattest wettest wetsuit whatsit
baddest haddest maddest lewdest widest modest oddest rudest loudest nudest reddest deadest saddest doughiest retest modesty fattest headset bittiest fittest haughtiest hoodiest peatiest dost dust moodiest mutest doest adust coattest fideist faddist sawdust mitiest nuttiest feudist deist sootiest detest shittiest chattiest wittiest whitiest wettest wattest tidiest tattiest doughtiest dotiest midst rowdiest fattiest rattiest bedsit pottiest matiest nudist cattiest beadiest leadiest gaudiest jettiest nattiest featest readiest nittiest battiest testy hottest meatiest latest quietest faddiest cutest headiest phattest muddiest gnattiest footiest nettiest knottiest ruddiest testa zootiest neediest odist hootiest goutiest sadist pettiest neatest hadst podesta test attest giddiest rootiest reediest poutiest guttiest seediest ruttiest deediest didst dottiest dowdiest tautest wadset weediest whitest bawdiest woodiest shadiest shoddiest
wides wades whidahs whids widdies widows wites