What is another word for "concealment"?

Roget's Thesaurus (1911) lists these synonyms for "concealment": abditory, adytum, ambuscade, ambush, and, back, background, behind, between, bite, blend, blind, blinker, blush, born, bridle, button, cave, cloak, close, closet, cloud, conceal, concealed, costive, costiveness, counsel, cover, covered, covert, crypt, curt, curtain, curtness, danger, dark, deceive, delitescence, delitescent, dim.