COFFERDAM Scrabble 20 Words With Friends 22 Scrabble letter values: C3O1F4F4E1R1D2A1M3 = 20 Definition noun large watertight chamber used for construction under water. — synonyms: caisson, pneumatic_caisson See all 215 words you can make from COFFERDAM → 9-letter words Words starting with C Words ending with M ← Unscramble different letters