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.
sherpa sharp sharpy charpai sharpie chirp chirpy charpoy chirrup chirrupy
sherpa repay arepa forepaw perp prepay charpai
sherry cherry share sharia shariah shear sheer shier shire shirr shoer shore shrew shri usher