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.
topaz tops dopas tapas tepas topes topis topos topees toupees toepiece taps tips tups
top dopa tapa tepa tope topee topi topo topoi toupee atop atopy stop stope utopia