This is the 9082nd most frequent Japanese word.
満潮
High tide.
The word '満潮' is used here to indicate 'high tide' referring to the time of day when the sea level is at its highest due to tidal forces.
満潮の時に海岸は水に覆われる。
During high tide, the coast is covered with water.
The usage of '満潮' here emphasizes the time or condition of the sea level being high, advantageous for a ship to leave port.
船は満潮の間に港を出発した。
The ship departed from the port during high tide.
Here, '満潮' is applied to discuss the natural condition of the sea during which fishermen find it favorable to conduct their activities.