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A cruciverbalist.
A cruciverbalist is can be the person who designs crossword puzzles or the person who attempts to solve them.
A slave who escaped was referred to as a fugitive or runaway slave.
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Cruciverbalist
cruciverbalist
Cruciverbalist
In the world of crossword puzzles, the answer is amah
You call them a slave driver or a slave's master.
Sudoku and crossword puzzles
If you are referring to a crossword puzzle, the term you are looking for is a 'Feat'.
Oeuvre - just had this one in a crossword.