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.
mars marse maars mairs maras mares mors mirs marrows marries mires moors murrs moras muras morse mores meres mures moires morass morros morris morose mbiras murras murres morays myrrhs morassy morrows murreys murries mercy mirza
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
mar mara mare maria marrow marrowy marry