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.
challas challahs chollas challis chalahs challies cholas chelas chills chillis chalehs chalaza chillies chalazia chalazae shallows shills cholos shoals sheals shawls chiels chyles shauls chilis chiles shales shells chalice chilies chylous sheilas shuls sials sheols shiels shools
wallas challas callas alas alls calls challahs halloas quillais hollas hulloas hallos hilloas gallus galeas galahs coalas walls maills hallahs mollahs mullas nullahs paellas palls zillahs dalles tallis wallahs challis ballsy halls balls fellas mullahs falls balas allays alias fellahs koalas galls galas cullays callus nalas malls lalls ollas palais scillas dalasi talas talls holloas phallus chalahs villas chollas las als
challa challah challie chally chalah chaleh chill chilli chilly cholla shall shallow