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.
sloops saloops slops slopes salps slaps slips saleps salpas sleeps slipes slypes
loops saloops bloops sloops lollops wallops glops slops galops clops calliopes plops flops gallops jalops elopes loups lops slopes collops dollops lopes shallops
sloop saloop slop slope sloppy aslope