Crossword clues for the word: BIOMASS The word BIOMASS has appeared as an answer to at least 10 crossword clues on different crossword puzzles. Crossword clues for BIOMASS Showing 1 to 10 of 10 results Clue(s) Living matter in total Much organic matter Natural material used for fuel One type of index Organic matter convertible to fuel Organic matter used for fuel Organic matter's weight Plant fuel Plant material used for fuel Renewable fuel source