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.
weigher wiver waiver wavier weaver weever whiffer whoever wafer waver wafery wavery woofer
higher nigher sigher weigher cougher laugher rougher cipher tougher