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.
sewars seawares sewers sowars swears sawers sowers
jowars sowars wars dewars sewars shewers chawers teawares lowers tawers rowers swears wairs hewers wares wears bewares bowers dowers towers gnawers powers chewers mowers knowers pawers viewers vowers rewears sawers ewers cowers seawares sewers sowers showers
sewar seaware sewer sowar sware swear