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.
umbras umbers
umbras mbiras morass camorras muras murras morays samburs tamaraus zamarras tamburas ombres timaraus samaras numbers timbres members bombers lumbars wommeras cumbers chambers lambers chimaeras moras ambers maras tamburs hombres cameras embers embars fumarase sambars tamaraos samurais tambouras ombers remoras embarrass mimbars timbers lumbers umbers limbers womeras combers woomeras gambirs chambrays cambers chimeras