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.
rainout runout rant riant rained ruinate rand runt rind rent ranid randy round rente rindy rondo runty reined rennet ruined reendow reigned reunite rondeau
rainout knout minuet minute pinot runout snout snouty not nut
rain rainy brain brainy grain grainy drain train trainee ran rin