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.
pearl pearly parle parol peril parral parrel parole parlay parley parolee puerile payroll purl prill prowl poorly prelaw purely pyrrol perilla purlieu
earl pearl aryl aril areal carl carol loreal beryl marly gnarly merle parol boreal parle pearly ceorl seral dearly cheerly sheerly nerol real nearly marl farle feral ferly harl herl irreal farl jarl queerly carle merl gnarl early peril cereal surreal ureal choreal yearly
pear per par parr sparry pere spare peery opera peerie aper peer perry parry pereia pareu pariah pareo pare parae para pair perea peri pier apery spar sparrow spear