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.
coapts coopts capotes copouts cowpats cupids
coapts pots spats spaits septs repeats pipits pupates pats opts patsy peats pets pits tippets tappets chapatis spots pates boughpots opiates spates sippets repots puppets pipets poppets moppets lappets puts cowpats coopts bowpots teapots depots whippets spits chappatis
coapt caped capita capote capped caput cooped coopt coped copied copout copped couped cowpat scaped scoped