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.
slopes slops sloops slipes slypes saloops salps slaps slips saleps salpas sleeps
lopes elopes calliopes slopes wallops dollops slops flops loups saloops loupes lollops glops gallops clypeus clepes loops lops sloops floppies bloops clops jalopies collops jaloppies galops jalops kelpies calipees plops callipees blypes slipes slypes talipes shallops
slope slop sloppy saloop salp salpa salpae slap slip slipe slippy sloop slype aslope