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.
cars carse cares carrs coarse caress caries gars crus curs cors cris carious carries carouse curse coirs cruse cries cress corse gaurs crows crews cures guars craws cores crass cross currs carassow crease curies karoos crouse crosse creese cooers creasy cressy course kaross kauris curios cruise cowries curries karroos quaeres curious cuirass kauries corries kors quarries curassow kirs kris gross gorse gorsy goers koras croci kiers grows grass craze keirs gores crazy grues gurus croze greys grays kurus grees
ars bars pars nears gnars lears maars bears boars ears guars fears feuars tears dears wears sears shears rears fiars vars gears oars knars mars lars liars cars jars gars haars hoars hears tars soars wars roars chars pears years