STRATIGRAPHY /stɹəˈtɪɡɹəfi/ Scrabble 21 Words With Friends 21 Scrabble letter values: S1T1R1A1T1I1G2R1A1P3H4Y4 = 21 Definition noun the branch of geology that studies the arrangement and succession of strata. See all 464 words you can make from STRATIGRAPHY → 12-letter words Words starting with S Words ending with Y ← Unscramble different letters