What is an adverb with the root mer/mar

These ROOT-WORDS are MAR, MARI, & MER meaning SEA & POOL. It comes from the Latin mare which means SEA. The SEA was of the greatest importance to the Romans. Mare Liberum, the open sea: Mare Clausum, the closed Sea: and Mare Nostrum, our sea which is now called the Mediterranean Sea. All the words on this list have a musical sound, from MERmaid to MARina. “The Ancient Mariner" sounds much more musical than “The Old Sailor" which means the same thing.