Thanks to Year 12 study of Greek and Latin roots in English, I see cruci (cross), verbal (pertaining to words), ist ('one who') so without needing recourse to a

Thanks to Year 12 study of Greek and Latin roots in English, I see cruci (cross), verbal (pertaining to words), ist ('one who') so without needing recourse to a dictionary it's fairly clear that a cruciverbalist is a person who deals with cross-word-puzzles.