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.
goats gats goatees coats gates goads gaits gouts coatis gods gateaus guts kats cots cats coatees gads qats gaieties gutsy gadis katas codas cates gauds cotes goods gowds coots kotos quoits kotows quotes gaddis quotas cottas coitus goodies cooties kowtows goddess codeias catties gaudies cads cods cuts kits
boats moats oats goats shoats coats doats votes feats kotos gates qats hates bots hots quoits botas lots beats gouts ghauts matts rotas toeas quotes reatas mots motes quotas nowts bouts cotes cats beauts meats pots jots goads patsy totes sates motts roads gnats iotas sodas touts routs toads toots whats woads rotos dates chats satis chotts ates shotes sots shotts dotes wats fates roots mates heats peats meatus tauts tates hoots outs riots nates pouts ratos fats gats rotis foots cates boots lotus rates batts knouts haets coots coatis tootsy fiats vats oots odas dawts katas cots notes hiatus kats poets loads gaits bats bates fatso aits lats mauts ghats phots photos moots bahts vatus biotas jotas footsy pats dauts rotes neats codas rats hats pates tats dots stoas jatos loots knots eats lotos baits louts lotas potsy mats riatas watts doits tots botts teats toits waits wheats seats rots wots soots cheats shiatsu shoots shots datos shouts
goat goatee gat got coat coatee coati gait gate gateau goad gout gouty agate