The Collaborative International Dictionary of English v.0.48:
Nailer \Nail"er\, n. 1. One whose occupation is to make nails; a nail maker. [1913 Webster] 2. One who fastens with, or drives, nails. [1913 Webster]WordNet (r) 3.0 (2006):
nailer n 1: a worker who attaches something by nailing it