Here is the wordlist
Peter Jacobs (University of Queensland) has written two excellent FlashForth tutorials and a reference sheet.
Elements of FlashForth Tutorial
FlashForth 5 Tutorial Guide
FlashForth 5 Reference Sheet
Here are a few general sources for learning Forth.
Programming Forth by Stephen Pelc.
Starting Forth by Leo Brodie.
Peter Jacobs wrote an article about FlashForth and got it published in the
CircuitCellar magazine of April 2015.
Forth on the front page of a magazine. Cool !