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.
curassow carassow cuirass crass curs craws crows currs cross grass cures curse cress grassy crosse creasy crissa course crease curacy curios curies cressy caress curious curiosa curries crus cris cars cors grows craze carse corse cries crazy gaurs gross carrs croze coirs guars cares cruse kurus crews croci grays cores koras gurus kaross queers crouse kouros grease caries creese cooers coarse guiros coryza cruise kauris greasy quires