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.
sweer sawer sewer sower swear sewar sowar sware swore seaware
weer sweer bower were weir mower knower pawer bowery rawer sewer rower ewer sower dewier dowery tower twier chewer shewer showery swear sawer fewer power viewer vower hewer cower cowier lower viewier lowery newer gnawer rewear wear dower tawer towery chawer chewier shower showier