WordNet (r) 3.0 (2006):

hiding place
    n 1: a place suitable for hiding something (such as yourself)

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "hiding place":
   adytum, ashram, asylum, bolt-hole, cache, cell, cloister,
   concealment, corner, cover, covert, coverture, cranny, cubby,
   cubbyhole, dark corner, den, dugout, foxhole, funk hole, hermitage,
   hideaway, hideout, hidey hole, hiding, hole, holy of holies,
   ivory tower, lair, mew, niche, nook, privacy, recess, refuge,
   retreat, sanctuary, sanctum, sanctum sanctorum, secret place,
   stash, undercovert