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.
sopite spite spit spait spate spied sopped souped sapote soaped spat spot sept sped speed septa sputa spade spaed siped spode spued sapid spout sapota sapped seeped sipped sippet speedy spotty supped zapateo zaptieh
spite sopite pit pupate uppity poppied depute spied pipit spit spate sapote repute lipide opiate spait capote capita pity pita pied pate copied tiptoe wapiti
sop sepia soap soapy soppy soup soupy