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.
hoopla hopple haply hiply huipil happily
hoopla whoopla plea pula byplay copal copula cupola play nopal opal papula people pepla replay splay cupula
hoop hoopoe hoopoo hop hope hoppy