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.
urease urase ureas uraeus ursa urus ursae
crease urease grease bears wrasse reuse resew coarse resee foresee phrase gyrase hoarse pears boreas nears praise prese reraise dears tears urase hears raise bureaus whereas shears lears creese areas eras erase greasy rase creasy fears fraise verse hearse ears gears carse choreas wears arse braise marse parse perse prase rears sears hydrase terse ureas years