You mean to tell me, they couldn’t improvise, get a dictionary and find some other words?
Unless they have changed the rules in the past few years, no.
The list of words is decided on before the Bee begins by a committee. There are a whole bunch of criteria that the words must meet to be included.
The list is quite long and is kept secret. Usually they do not run out of words, this time was an exception.
Now if it becomes the norm then they are going to have to start adding a few thousand more.