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.
chirrupy chirrup chirpy chirp charpoy sharpy sharp sherpa
chirrupy roupy croupy larrup sirupy syrupy chirrup
chirr chirre chair charr charro charry cherry chiro chiru choir churr churro shirr