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.
torpor dorper trapper tripper trippier draper drapery dripper trooper trouper drippier
torpor repour harper carper corpora dorper warper chirper sharper
dorp tarp towrope trap trip tripe trippy trop trope