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.
spite sopite spit spate spait spied sapote sped spot spat sept septa sputa spaed speed spode spued spout spade siped sapid seeped sapped sapota spotty speedo sippet speedy sopped soaped sipped supped souped zapateo zaptieh spud
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