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.
purs pursy purrs purse pours puris pursue purees pars pros proso peers prase piers peris pyres prows prosy prese parse paris pears priss prays paras prise peres pores pares prose praus presa prees pries pyros parrs pairs preys perse proas praos press pross paries pareus porous pareos praise hypers pooris parous prissy porose peruse pariahs parries peeress peeries perries prossie prez price pricy prize
burs knurs tours sours sieurs purs pours ours knaurs fours lours gaurs curs giaours hours furs yours