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.
greasy grassy creasy grease greys grays gores grees grues gorsy grass cressy crease gurries gars gross graze cores craws crazy cress koras goers guars cures gorse grows gaurs crass cries grace cares crews gurus curacy grouse curies caress guiros creese kersey quires caries kyries corries cowries cuirass kauries kerries carries quaeres kerrias queries curries carassow curassow quarries
creasy greasy gears crease cressy grease phoresy grassy lears heresy rears daresay dressy tressy urease whereas shears nears eras hears fears ears resay bureaus brassy boreas bears areas morassy pears sears dears tears ureas wears choreas years
gore gray gree grew grey grue agree ogre recarry wreaker