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.
ires iris
res ares pares lyres meres lores rares pores cires gores quires gyres zaires sires dures aures tarres cores bares tores hires tyres bores wheres byres wires barres chirres moires shares nares shores mures eyres fares tares ores lures mares lares pyres peres ceres cures quaeres ires sores seres dares hares cares feres vires mores shires murres chores mires chares whores haeres fires wares fores tres heres tires yores