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.
radian redan radon ratan rattan retain ratine ratany reattain rutin redon redden ridden redeny retine redone ratten ratton ratoon ratteen rattoon retinue routine written
radian median dan din dine sheitan dino witan beduin soudan aedine sedan medina boudin dawn dean hoddin mueddin iodin redan iodine seitan codein titan ladino shaitan fadein hyoidean
radii radio rad trade rarity krait grad raid raita read readd ready redia rediae braid irade road grade roadeo orad roadie trad brad trait