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.
heavier heaver haver havior heifer haviour hover hoover huffier higher hoofer
heavier wavier leavier vier aver aiver wavery waiver savvier saver beaver riviera haver caviar leafier havior naiver jivier livier weaver paver knavery heaver quaver levier laveer newwaver laver pavior reaver quavery raver riviere caver savior suaver waver leaver bouvier shaver