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.
miffy miff muff maffia
iffy miffy biffy jiffy iff riff chaffy baffy whiff biff tiff buffy diff huffy daffy jiff coiffe quiff deify miff taffy pouffy toffy puffy wifey reify chuffy