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.
rubout robot rebut rebought reboot rubati rubato rowboat rabat rabbit rabbet rebody rebait rabato rebato rebate rubied rubbed rabbity
bout about rubout bot but boot towboat bota debut abbot sabot abut robot boat butt rebut rowboat bute bott seaboot jabot doubt reboot showboat
rub rubby rube ruby grub grubby krubi drub