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.
sowar sewar sower sware swear seaware sawer sewer sweer swore
jowar sowar war power tower knower dower mower swear lower sower seaware cower sewar rower bower vower rewear aware wear waur wary ware wair beware sware dewar teaware shower