From WordNet (r) 3.0 (2006) [wn]:
digger
n 1: a laborer who digs
2: a machine for excavating [syn: power shovel, excavator,
digger, shovel]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Digger \Dig"ger\, n.
One who, or that which, digs.
[1913 Webster]
Digger wasp (Zool.), any one of the fossorial Hymenoptera.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Diggers \Dig"gers\, n. pl.; sing. Digger. (Ethnol.)
A degraded tribe of California Indians; -- so called from
their practice of digging roots for food.
[1913 Webster]