What's the noun for snails? Here's the word you're looking for.
snail
Any of very many animals (either hermaphroditic or nonhermaphroditic), of the class Gastropoda, having a coiled shell.
(informal, by extension) A slow person; a sluggard.
(engineering) A spiralcam, or a flat piece of metal of spirally curved outline, used for giving motion to, or changing the position of, another part, as the hammer tail of a striking clock.
(military, historical) A tortoise or testudo; a movable roof or shed to protect besiegers.