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