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.
seasons sessions sasins seisins cessions sassiness scissions sozins seizins sozines siziness sauciness sissiness sissyness zazens
reasons masons weasons seasons sons bisons disowns sasins caissons mesons essoins sones sonsy azons basins bassoons gossoons fissions liaisons missions poisons foisons passions cessions scissions lessons hysons sessions bosons