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.
coopts coapts copouts cowpats capotes cupids
coopts opts pots poets pits pets moppets pats pipits potsy sapotas septs spats spots depots teapots whippets puppets pouts boughpots pipets bowpots capotes coapts copouts cowpats lappets puts poppets repots sapotes sippets spits spouts tappets tippets wipeouts
cooped coopt coapt coped copied copout copped couped cowpat scooped scoped