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.
planer plainer planner planar planaria plenary
leaner cleaner loaner gleaner planer bilinear planner linier planar eloiner millinery cloner loonier lanner linear clownery lunier liner aliner collinear byliner colinear milliner flaneur plainer loner aliener sullener