Here you can download useful lists for learning short and longer words in English.
On 1 July 2019, CSW19, the 5th edition of Collins Official Scrabble Words (ISBN 978-0-00-832012-6), took over as the official wordlist for tournaments sanctioned by the international Scrabble association WESPA. The book is divided into two sections: first words with 2-9 letters, then words with 10-15 letters. CSW19 contains 279,496 words in total (162,542 2–9 letter words). There are 2,862 new words (617 with 2–8 letters) and 29 words have been deleted compared to CSW15. The first tournament in Sweden to use CSW19 was the Swedish NSC 2019.
Lists for CSW19
Here are among other things lists with all new words, all valid 2 and 3-letter words (also with hooks) as well as longer words of interest.