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.
quass quassia quays quasi quais queasy cuss kusso gussy gassy guess queys cusso gauss cuisse kousso queues gussie cassia queazy gas kas qis kiss kues coss gays cues casa keas gaes kaas caws cays kays guys koss kaes goas koas case quiz
quass ass cuss cusso gassy gauss guess gussy hussy fussy lasso lass masse mousse mussy passe pussy sass suss tasse wussy mass bass kousso lassi bassy basso bassi kusso quasi fuss buss quais quays luaus massa massy muss pass puss wrasse sassy tass wuss chasse
qua quai quay aqua aquae quack quacky quag quagga quaggy quake quaky squaw