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.
gauss guess gussy gassy gas gussie cuss goas gays guys gaes gawsy cusso gauze quass guise cause kusso gauzy cassia causey gawsie kousso cuisse quassia gos kas kaas case cues kues caws koss kiss gaze goos goes kays coss cays koas goys casa keas kaes
gauss ass hussy cause cuss cusso gassy gussy vaus kusso lass mass lasso miaous muss pass pause pussy sass suss tasse wuss chasse masse fuss fussy luaus beaus bassy basso bassi bass guess buss kousso quass lassi massa massy mousse mussy passe puss wrasse sassy tass taus wussy chiaus