The term 'FORESTRY UNIT' is composed of two words, 'FORESTRY' and 'UNIT'. The word 'ACRE' is a 4-letter solution to this crossword. An ACRE is a UNIT of area measurement, equal to 43, 560 square feet or 10, 000 square meters. It is commonly used in the United States and other countries to measure land area, especially for agricultural and forestry purposes. In forestry, an ACRE is often used to measure the size of a forestry UNIT, which is a designated area of land set aside for the purpose of managing and protecting forests.