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.
gnars gnarrs knars nares naris nears knaurs nairas nairus narrows knurs noirs noris nurse nereis norias
knars gnars ars jars hearse knaurs hares bears gars lares bares roars parse pares carse fairs carrs boars rares ares mairs vairs guars liars haars pairs tears tiaras saros shares charrs vars charas wears dares wares bars nears tares tars marse dears parrs soars airs nares mares lars hoarse arse knurs saris oars cars tahrs paras souaris wars gaurs tarsi fiars ears paris hears faros pears pars lears laris fears naris feuars shears maars chares gnarrs varus mars varas maras hairs cares fares pharos hoars chars gears lairs coarse rears sears deairs taros wairs chairs years
gnar gnarr knar knarry naira nairu narrow nary near genre genro snare unary