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.
navar naiver knavery newwaver never
navar var chivari waver savor reaver paver newwaver laver quaver covary caviar caver heaver vivary haver favor beaver aver afar vary vara leaver vair ovary raver saver suaver weaver shaver
knave naevi naive nave navvy navy nova novae