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.
pettish potash potiche padishah petechia petechiae padshah
fattish hottish cattish pettish rattish ruttish sottish wettish fetish goatish latish loutish whitish
petti pattie petto petty putti puttie pet