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.
gotten cotton kitten cottony cotan coden catena codein godown guidon ketene catenae codeina codeine quieten
batten gotten rotten latten ratten fatten kitten shotten sitten litten patten mitten written bitten ten eaten heighten quieten beaten lattin poteen button gittin neaten lutein laten stein tauten ratteen whiten sateen rattan ratton cotton paten catena neoteny retene jetton butene potteen boughten mutton ketene mattin teen steno wheaten oaten lateen
got cotta cottae goat goatee gout gouty gutta guttae gutty