The story
From nut + driver, attested since circa 1900 and widespread in various industries since the 1920s; modeled on the earlier screwdriver.
Etymology from Wiktionary, CC BY-SA 4.0.
nutdriver
Today it means: A hand tool for driving nuts and bolts; similar to a screwdriver but with a different tip, usually a hexagonal socket (recess) for driving fasteners with external hexagonal heads. Suitable for low- and medium-torque applications. Full definition →