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.
blocks blocs bullocks bollocks blacks blokes blogs bulks balks bilks baulks bleaks beyliks beylics belleeks bellicose belgas bollox belugas bowlegs
blocks relocks clocks bullocks shlocks rowlocks killocks pollocks shylocks bollocks mullocks flocks hillocks locks clacks blokes pollacks looks flecks lucks clucks klicks licks cloaks locus slicks killicks placks shellacks locos blacks palookas flocs flicks rollicks cowlicks lacks folks flacks relooks holks plucks slacks blocs clicks talookas yolks
bloc block blocky black blog bloke obloquy