Plutons are large intrusive igneous rock formations that form beneath the Earth's surface. These formations are commonly named after their composition, texture, shape, and size. Some synonyms for plutons include batholiths, laccoliths, sills, and dikes. Batholiths are large plutonic formations with an area covering over 100 square kilometers. Laccoliths are similar to batholiths but smaller in area. Sills are horizontal intrusions that occur when magma flows between layers of pre-existing rocks. Dikes are vertical intrusions that form when magma flows upwards along pre-existing fissures or fractures in the rock. These synonyms help geologists to describe plutonic rock formations more effectively.