EXTENSIONAL Scrabble 18 Words With Friends 21 Scrabble letter values: E1X8T1E1N1S1I1O1N1A1L1 = 18 Definition adjective defining a word by listing the class of entities to which the word correctly applies. See all 654 words you can make from EXTENSIONAL → 11-letter words Words starting with E Words ending with L ← Unscramble different letters