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.
blocs blocks blogs bullocks bollocks blacks blokes beylics bulks balks bilks bellicose baulks belgas bleaks bollox belugas beyliks bowlegs belleeks
flocs blocs logs locus locos locks lacs hillocks alecs lilacs cologs pollocks relocks sawlogs sulcus duologs telcos shlocks clogs blocks beylics colics bollocks bullocks flics flocks flogs clocks blogs killocks mullocks relics rowlocks slogs dialogs talcs shellacs shylocks
bloc block blocky black blog bloke obloquy