Concretion
Part of speech: noun
Definition: The process of aggregating or coalescing into a mass. A solid, hard mass formed by a process of aggregation or coalescence. A rounded mass of a mineral, sometimes found in sedimentary rock or on the ocean floor. The action of making something concrete or the result of such an action.
Compression
Part of speech: noun
Definition: to increase in density; the act of compressing, or the state of being compressed; compactionthe cycle of an internal combustion engine during which the fuel and air mixture is compressedthe process by which data is compressedthe electronic process by which any sound's gain is automatically controlled
Example sentence: The compression of time one experiences when you're a small person underneath this huge avalanche is amazing.