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.
topic typic tapioca tupik
biopic topic pic pica pick epic gopik sapphic sepic spic spica spick typic
topi top tipi tope topee topo topoi toupee atop atopy stop stope utopia