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.
retool retile retell retail rootle retally rotl ratal redly ratel ritual rudely reddle rattly redial rattail readily reedily rowdily ruttily ritually
tool retool stool atoll stole sotol citole citola metol phytol ketol dooly tolu toll tole tola toil wittol
ret rato reata redo rete retie roto arete fret fretty pretty reroute tret