The term 'lumber' refers to the process of cutting down trees and processing them into usable WOOD. The crossword solutions for this term include 'LADE' (4 letters), 'TAX' (3 letters), 'BARGE' (5 letters), 'STUMP' (5 letters), 'SADDLE' (6 letters), 'WEIGH' (5 letters), 'SLOG' (4 letters), 'TRUDGE' (6 letters), 'SHAMBLE' (7 letters), 'LOAD' (4 letters), 'CHARGE' (6 letters), 'burden' (6 letters), 'CLUMP' (5 letters), 'PLOD' (4 letters), 'TIMBER' (6 letters), and 'WOOD' (4 letters). These words all relate to the process of lumbering, from the act of cutting down trees to transporting them to their destination.