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.
quash quaich gash cash gush gushy kasha cushy cuish cushaw quiche cashaw cashoo cashew quitch gouache cosh gosh
quash ash fash bushy bush beauish bash lash hash lush mushy mashy push rash rushy sushi dashi deash tushy washy choush pash ashy cash mush cushy gash gush gushy kasha hush cuish leash mash gnash pasha pushy rush sash dash dashy tush wash wushu shush
qua quai quay aqua aquae quack quacky quag quagga quaggy quake quaky squaw