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.
whish wish which wisha whoosh wash washy woosh wushu wich
whish cuish wisha which dishy dish rishi poisha pish knish geisha beauish hush heishi hash fishy fish wish shush