sledge (n.1)

"heavy hammer," Old English slecg "hammer, mallet," from Proto-Germanic *slagjo- (source also of Old Norse sleggja, Middle Swedish sleggia "sledgehammer"), related to slege "beating, blow, stroke" and slean "to strike" (see slay (v.)). Sledgehammer is pleonastic.

sledge (n.2)

"sleigh," 1610s, from dialectal Dutch sleedse, variant of slede (see sled (n.)); said by OED to be perhaps of Frisian origin.

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Definitions of sledge from WordNet
sledge (v.)
transport in a sleigh;
sledge (v.)
ride in or travel with a sledge;
the antarctic expedition sledged along the coastline
The children sledged all day by the lake
sledge (v.)
beat with a sledgehammer;
Synonyms: sledgehammer
sledge (n.)
a vehicle mounted on runners and pulled by horses or dogs; for transportation over snow;
Synonyms: sled / sleigh
sledge (n.)
a heavy long-handled hammer used to drive stakes or wedges;
Synonyms: maul / sledgehammer