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.
root rooty rot roti rood rout rota roto riot rote rodeo wrote rotte route roadeo rod ret rut rat writ rate rite rete rato redo rode road radio rowdy raita rhyta retie reata ratty rutty riata write
boot foot hoot coot loot moot oot root soot toot shoot