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.
sheerest cheeriest chariest charriest shoreside christy christie
queerest sheerest merest serest erst rest fieriest verst wrest leeriest airiest furriest reest freest burriest verste beeriest breast crest leariest presto hoariest drest goriest charriest wiriest wariest tercet tarriest direst forest surest sorriest barest rearrest purest firriest eeriest fairest wriest preset hairiest nearest resit reset aeriest verset veriest resat merriest querist arrest airest miriest mooriest poorest verist prest priest rarest searest sorest sourest dearest dourest driest teariest truest weariest chariest cheeriest yarest
sheers cheerios cheeros cheers shears sherries sherris shiers shoers scherzi scherzo ushers