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.
sphery sypher sphere cypher sigher cipher sever siver saver safer savory severe soever suaver suffer zephyr savoury savvier
sphery faery weigher wafery sypher sphere cypher rougher refry fiery veery very every higher ferry quavery gopher quivery laugher livery knavery nigher puffery revery cipher sigher cougher tougher wavery shivery