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.
datchas dachas ditches tachs techs dashes dashis taches douches teaches touches duchies techies duchess dishes toshes tushes deashes tushies
gotchas datchas hutches vetches fitches hatches etches butches nautches fetches bitches mutches pachas pitches letches retches quitches wretches batches botches chais tachs watches matches chays hootches cutches catches chaos hotches itches chase chaws hitches chias notches aitches ketches nachas patches mochas ratches litchis rotches latches dachas ditches techs witches