The term BOG MATTER is a combination of two words: PEAT (4 letters) and MATTER (6 letters). PEAT is an accumulation of partially decayed vegetation or organic MATTER found in wetlands, bogs, and mires. It is composed mainly of mosses, sedges, and other herbaceous plants. MATTER is anything that has mass and occupies space. Together, BOG MATTER is a type of organic MATTER found in wetlands, bogs, and mires that is composed of partially decayed vegetation and other organic MATTER.