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.
propped prepped pereopod pereiopod parapet prepaid parapodia
propped cropped dropped wrapped trooped dripped trapped rapped repped ripped roped rouped bewrapped crapped gripped groped grouped prepped rewrapped drooped frapped tripped trouped
prop preop preppie preppy pyrope