Full tides are the peaks of water levels in the ocean, caused by the gravitational pull of the moon and sun. There are several synonyms for this natural phenomenon. The term "high tide" is commonly used to describe the same occurrence. Another word that can be used interchangeably with full tides is "flood tide," which refers to the rising tide moving inland. Additionally, "spring tide" is another term used to describe full tides, which occur when the sun, moon, and earth align in a straight line, resulting in a stronger gravitational pull. Finally, "ebb tide" is a synonym for low tide, which is the opposite of full tides. Overall, there are several words that can be used to describe these regular occurrences of the tides.