Unfortunately, Scratch refuses to let me save a project with long lists so you have to manually import the words in the longer lists from bit ly/scratch_words_list (Scratch also refuses to let me write that link with the dot, for more obvious reasons)
Alternatively, you can manually split the file at github.com/dwyl/english-words/blob/master words_alpha.txt (or any other list you prefer) into 2 text files and import it into Scratch. Split it roughly in half, the lists do not have to be equal length, but neither can be above 200,000 lines.