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.
samaras sambars samurais zamarras simars smears samburs seamers zamarros summarise summaries cymars seemers simmers summers sombrous summarize
samaras maras mars chimeras chimaeras simars wommeras fumarase umbras cymars tamaris remoras tamaraos mimbars dammars lumbars zamarras cameras muras embars moras chimars woomeras womeras timaraus tamaraus damars daymares sambars maars mairs mares marse smears shmears
samara sambar samurai simar smear smeary zamarra zamarro