HYDROLOGY Scrabble 20 Words With Friends 19 Scrabble letter values: H4Y4D2R1O1L1O1G2Y4 = 20 Definition noun the branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservation. See all 65 words you can make from HYDROLOGY → 9-letter words Words starting with H Words ending with Y ← Unscramble different letters