The term BARK SITE can be solved by the crossword solution TREE, which is a four letter word. Tree is a type of perennial plant that has a trunk and branches and is typically taller than shrubs. Trees are an important part of the natural environment, providing food, shelter, and oxygen to many species of animals and plants. Bark is the outer layer of a tree's trunk and branches, and bark sites are areas where trees are harvested for their bark.