As nouns the difference between lye and limestone
is that
lye is an alkaline liquid made by leaching ashes (usually wood ashes) or
lye can be (uk|railways) a short side line, connected with the main line; a turn-out; a siding while
limestone is (mineralogy) an abundant rock of marine and fresh-water sediments; primarily composed of calcite (caco₃); it occurs in a variety of forms, both crystalline and amorphous.
As a verb lye
is .
As an adjective limestone is
made of or with limestone.