6 letters · 10 points in Scrabble
originFrom dog (“part of a crane that holds the items to be lifted”) + -man (suffix denoting someone (possibly implied male) who is an expert in an area, who is employed or holds a position in an area, or who takes part in an activity), from the fact that such a person would often ride on the load lifted by the crane when carrying out their duty.
Etymology from Wiktionary, CC BY-SA 3.0