The term 'flood stage' refers to the level of a body of water that is considered to be a flood. When the water reaches this level, it is considered to be a flood. The two crossword solutions for this term are 'EBB' and 'CREST'. 'EBB' is a noun meaning the gradual decrease in the flow of a body of water, while 'CREST' is a noun meaning the highest point of a wave or the highest level of a body of water. Together, these two words describe the two extremes of a body of water's level, with 'EBB' referring to the lowest level and 'CREST' referring to the highest level.