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.
charkas charks chirks sharks charquis shirks shrieks shrikes choragus choregus shrugs
parkas markas charkas arks sarks charks teargas narks warks markkas taroks larks quarks marks parks harks burkas barks barcas araks carks darks sharks
chark charka charqui chirk shark