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.
renowns reunions renins rennins ronions renounce
knowns renowns annonas neons anions nouns noons nones guenons nonas minions ninons fanions ronions tenons wanions pennons phonons bunions inions ionones cannons canons quinones munnions onions pinions pinons fanons pinones reunions xenons unions chinones