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.
parol parole parolee payroll parle pearl prole prowl pyrrol parlay parrel parley pearly parral pyrola purl pyrrole peril prill poorly purely puerile purlieu
carol parol aril roll role growl marly gnarly aryl nerol neroli broil parole pearl prole pyrola pyrrole dearly drool troll parle earl nearly marl early farle harl jarl carl carle farl caroli gnarl roil payroll pearly prowl pyrrol reroll droll triol yearly
pro par sparrow spar pair para parae pare pareo pareu pariah parr parry pear prao proa prow pyro spare sparry