Here you can download useful lists for learning short and longer words in English.
On 15 September 2015, CSW15, the 4th edition of Collins Official Scrabble Words (ISBN 978-0-00-758916-6), became 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. CSW15 contains 276,663 words in total (161,417 2–9 letter words). There are 6,500 new words (4,171 with 3–9 letters), no new twos, and no words have been deleted compared to CSW12. The first tournament in Sweden to use CSW15 was the Swedish NSC 2017.
Lists for CSW15
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.
New words Pdf file