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.
reunite rente runt rent ruinate runty rennet runout reined reigned rant rend ranid riant round rainout reendow rondeau
gunite reunite dunite unite unit nite gahnite unity lenite sienite pinite mannite auntie vauntie quinte dunnite kainite lunate finite untie nit