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.
grebes grabs garbs grubs caribes corbies kerbs curbs cribs crabs carbs carbos carobs krubis carboys carabaos caribous
grebes rubbies derbies zareebas probes kerbs corbies herbs freebies rebbes rebs rebus ribes robes rabbies rubies rubes barbes barbies bribees bribes aerobes freebees verbs caribes rabies ourebis zarebas darbies tribes
grebe garb grab grabby grub grubby