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.
whiffed whiffet wifed waffed waifed whoofed wived waived woofed weighed waved wifty weaved
biffed miffed tiffed whiffed riffed coiffed doffed naffed waifed luffed cuffed muffed gaffed ruffed pouffed reffed reified quaffed chaffed chuffed deified piaffed waffed fifed cheffed wifed daffed coifed puffed huffed whiffet offed knifed baffed boffed buffed feoffed yaffed fed