Using Rhyme Zone, you'll notice that nothing rhymes perfectly with sulphur, though there are a couple of near rhymes that you could use.
Color, suffer, thunder, and vulgar all are near rhymes and pertain rather closely to sulfur and have the same number of syllables.
Sulfur is yellow in color, you could write about that.
It smells vulgar, enough to make someone suffer.
Sulfur is also an ingredient in gunpowder, which explodes with a boom of thunder, and since gunpowder revolutionized war, it also made people suffer...you could also work in the word revolver, since that's kind of close.
