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.
sloped slopped sliped slapped slipped salpid slept slipt slipout
looped galloped eloped lolloped blooped walloped sloped galoped loped dolloped polyped lapped filliped slipped louped glopped milliped flopped ycleped phyllopod clopped leaped cleped milleped palped plopped slapped cheliped flipped shlepped lipped taliped gulped aliped lopped clupeid kelped blipped beleaped helped millepede sliped pulped slopped dewlapped bleeped millipede clipped pleopod flapped whelped chilopod clapped yelped
slope slop sloppy saloop salp salpa salpae slap slip slipe slippy sloop slype aslope