The term 'completely covered' can be described by three crossword solutions: ENVELOPED (9 letters), ENCASED (7 letters), and AWASH (5 letters). ENVELOPED means to be surrounded or enclosed, as if in a covering, while ENCASED means to be enclosed in or as if in a case. AWASH is an adjective meaning to be flooded or covered with water or other liquid. All three words describe the idea of being completely covered, either by a physical object, such as a case, or by a liquid.