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.
omasa oms ohms
masa omasa mas amass camass mays pneumas gamas maws massa mass maes biomass mesa caeomas limas llamas lamias lumas mambas mimosa nemas pimas rumbas sambas simas summas zymase dumas shamas gummas gambas comas hyphemias doumas samosa somas pumas cymas moas amahs camisa gammas bemas bimahs bimas zamias amas chamisa camas commas amias lamas lemmas limbas loumas mamas mammas mommas nomas gamays shammas