Cowl

Noun

 * 1) A monk's hood or hooded robe
 * 2) A mask that covers the majority of the head.
 * 3) A metal protective covering that covers the engine; also cowling
 * 4)  A ship's ventilator with a bell-shaped top which can be swivelled to catch the wind and force it below
 * 5)  A vertical projection of a ship's funnel that directs the smoke away from the bridge

Thesaurus
blanket, cloak, coat, cover, coverage, covering, covert, coverture, cowling, curtain, drape, drapery, guise, hanging, hood, housing, mantle, mask, pall, screen, shelter, shield, shroud, veil, vestment