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Yes, if it is not an insulated wire. If it is bare copper it is always ground. But the hot and neutral wire are also copper, they are just insulated.
If you mean 2 bare copper wires those are the ground wires. Tie them together and then connect the light fixture ground wire which will be green or bare copper to those ground wires.
# 10 bare copper.
#4 bare copper connected to two 8' copper ground rods 6" apart driven into the ground.
#6 bare copper wire.