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.
blocky block bullocky bloc bullock black bloke balky bulky baulky blog bulk bilk balk baulk bleak belike beylic beylik beelike belleek bowlike bowllike
bullocky shlocky mullocky hillocky blocky flocky hillock shylock kolacky shlock killock rowlock colicky relock flock plucky block folky flecky lackey clock pollock bullock rollicky lucky talcky mullock lock yolky
below blooey blooie blow blowy bolo