The Collaborative International Dictionary of English v.0.48:

Collier \Col"lier\, n. [OE. colier. See Coal.]
   1. One engaged in the business of digging mineral coal or
      making charcoal, or in transporting or dealing in coal.
      [1913 Webster]

   2. A vessel employed in the coal trade.
      [1913 Webster]

WordNet (r) 3.0 (2006):

collier
    n 1: someone who works in a coal mine [syn: coal miner,
         collier, pitman]

U.S. Gazetteer Counties (2000):

Collier -- U.S. County in Florida
   Population (2000):    251377
   Housing Units (2000): 144536
   Land area (2000):     2025.341438 sq. miles (5245.610020 sq. km)
   Water area (2000):    279.585724 sq. miles (724.123671 sq. km)
   Total area (2000):    2304.927162 sq. miles (5969.733691 sq. km)
   Located within:       Florida (FL), FIPS 12
   Location:             26.155113 N, 81.671313 W
   Headwords:
    Collier
    Collier, FL
    Collier County
    Collier County, FL