Excludes words with special semantics and used in the forth.scm stage only (0BRANCH BRANCH, 0JUMP, JUMP), and interpreter words (QUIT, INTERPRET). If a WORD word (e.g. CATCH, THROW) works correctly according to the standard using other CORE words, then all of its constituent word are considered correct as well.
I/O words (key input, sprite drawing, etc.) and variables and constants are omitted.