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.
gaseity gast gusty gassed gusset casita casette caseate gazette gust cast cassette coast cased guest caste coset gazed gusto caused goosed guised cosset keyset cassata coesite gooiest guessed gussied
gaseity suety feisty piosity russety cecity set sit sty