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.
welches welshes
belches gulches welches filches mulches zilches culches fleches caleches molochs loaches lyches lychees leches liches leaches cloches leeches letches laches slouches pleaches slatches clachs fletches glitches bleaches guilloches klatches cultches clutches lichees blotches cliches caliches flitches lochs latches fleeches welshes