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.
biomass bimas bimahs biomes bemas bombs booms bimbos bombes bimboes bams bums beams bemuse bamboos
biomass mass somas massa masse massy amass caeomas camass comas commas loumas mommas nomas omasa doumas mas oms