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.
augured agreed acred aigret aggrade aigrette acrid acarid agorot acaroid
augured figured degreed sugared squared scoured saggared recurred cured curred gored gourd greed guard quired agreed beggared buggered jiggered leaguered liquored pagurid required saggered secured squired daggered chequered