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.
sourest sorest surest sorriest serest searest sourced serosity
purest sourest dourest surest rest direst mooriest firriest resat reset aeriest wrest wriest resit fairest merriest breast arrest leariest miriest drest goriest serest sheerest hairiest veriest priest purist rearrest crest merest sorriest durst teariest truest weariest wurst charriest beeriest airest burriest barest aurist queerest curst burst fieriest furriest leeriest forest nearest freest eeriest poorest presto hoariest airiest prest reest rarest searest sorest hurst dearest preset jurist driest tarriest tourist wariest wiriest chariest cheeriest yarest
soirees sores souaris source sours surreys tsores tsouris