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.
markka markkaa marka mark maraca margay marc merk mirk murk mirky murky marque marquee
markka burka eureka marka markkaa parka charka
mar maar mair mara mare maria marrow marrowy marry