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.
whaup whap whup wap whip whop wheep whoop whippy whoopee whoopie wop weep wipe
whaup hap hup heap jaup taupe whap whup chap chape cheap shape yaup