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.
slops sloops slopes saloops salps slaps slips saleps salpas sleeps slipes slypes
lops shallops dollops plops collops galops glops clops slops lollops flops gallops jalops wallops flaps palps palpus bloops lopes helps slips loops whelps dewlaps pulps salps polyps tulips clips kelps saloops shleps milpas sloops blips flips salpas saleps gulps claps alps jalaps keleps kalpas calliopes laps loups pullups fillips juleps lips slopes slaps elopes yelps
slope slop sloppy saloop salp salpa salpae slap slip slipe slippy sloop slype aslope