A marigraph, also known as a tide gauge or oceanographic gauge, is a device used to measure the changes in sea level. However, there are other words that can be used as synonyms for marigraph, such as water level recorder, seismometer, or oceanic barometer. The primary function of these devices is to record changes in water pressure or temperature in the oceans. Seismometers, on the other hand, record changes in earth's crust that can cause tsunamis or earthquakes. Generally, these synonyms perform the same function of measuring changes in water, air, or earth, but with varying degrees of precision and accuracy. They are used for different purposes like tracking weather patterns or predicting natural catastrophes.