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.
drupe drape troupe drapey dorp drip drop droop tripe trope drippy droopy towrope tarp trap trip trop
drupe croupe chirrupy troupe tripe ripe syrupy sirupy serape pyrope larrup groupie group grope gripe grape croup rape cripe crepe crape rupee roup rope hyperope sarape sirup syrup drape towrope trope chirrup sharpie