1. partly submerged at high water: partially covered and partially dry at high water.
  2. always dry: not covered at high water under average meteorological conditions.
  3. always under water/submerged: remains covered by water at all times under average meteorological conditions.
  4. covers and uncovers: expression intended to indicate an area of a reef or other projection from the bottom of a body of water which periodically extends above and is submerged below the surface. Also referred to as dries or uncovers. (IHO Dictionary, S-32, 5th Edition, 1111)
  5. awash: flush with, or washed by the waves at low water under average meteorological conditions. (adapted from IHO Dictionary, S-32, 5th Edition, 308)
  6. subject to inundation or flooding: an area periodically covered by flood water, excluding tidal waters. (Digital Geographic Information Standard - DIGEST 1.2)
  7. floating: Resting or moving on the surface of a liquid without sinking (Concise oxford Dictionary)