Here is a list of nouns that start with SL.
slab, slack, sladang, slanderer, slang
slant, slapstick, slat, slate, slaughter
slave, slavery, slaying, sledding, sleep
sleeping, sleepwalker, sleet, sleeve, sleuthing
slice, slick, slicker, slide, slight
sling, slingshot, slip, slippage, slipper
slipstream, slit, slitter, slob, sloe
slogan, sloop, slop, slope, slot
slouch, slowing, sludge, slug, slugger
sluice, sluicehouse, slum, slumber, slump
Hope you enjoy this page of nouns that start with sl and the rest of this noun list a-z site as well.
Help make this a better resource by adding more nouns in the comments section. Thanks.