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.
knobbed nabbed nibbed nobody niobate niobite
fobbed robbed lobbed bobbed mobbed hobbed knobbed jobbed sobbed gobbed dibbed tabbed gibbed sabbed fibbed subbed robed boobed cabbed fubbed hoboed tubbed gabbed ribbed jibbed gobbet lobbied tabbied nabbed jabbed nibbed dubbed lobed rubbed ebbed bibbed dabbed webbed bed
knobby knob knubby nobby snobby nob