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.
parrel parral parle parol pearl pearly prelaw parole purely pyrrol parlay parley payroll parolee pyrrole purl peril prill prole prowl poorly puerile purlieu
barrel parrel sorrel quarrel ferrel carrel reel cruel sorely saurel corral rarely sorel cereal boreal parral carrell morel purely loreal choreal real surreal oriel irreal ariel rely riel laurel barely jurel areal direly creel surely pyrrol gruel merely ureal yarely
parry parr par pear sparrow spare spar purr perry pareu pariah pareo pare parae para pair sparry