different between wrencher vs drencher

English

wrench +? -er

wrencher (plural wrenchers)

From Middle English *drencher (found in the Surname Drencher), equivalent to drench +? -er.

drencher (plural drenchers)

One who, or that which, drenches.
A fire prevention device, like a sprinkler but ejecting a denser curtain of water and sometimes mounted on the outside of a building to prevent the spread of fire from those nearby.
- 2008, John Ridley, John Channing, Safety at Work (page 675)
  A second system of conventional dry sprinkler heads is interspersed with the drencher heads.
- 1950, Great Britain. Ministry of Public Building and Works, Post-war Building Studies (issues 28-31, page 14)
  The drencher supply should also be separate from the sprinkler supply.

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