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.
posadas pesades posts passados passades passadoes pseuds posits posties pesetas possets piosities pasts pests poussettes pastas pastes pastis pestos pistes pasties pistous pseudos
posadas sades sadis saids sodas cassatas misadds passades passados pesades resedas tsades tsadis