Vatman vs. Batman: What's the Difference?

Vatman and Batman Definitions
Vatman
(papermaking) The employee responsible for gathering pulp from the vat on the mould in papermaking.
Batman
A British military officer's orderly.
Batman
(military) A servant or valet to a military officer.
Batman
A personal assistant or supporter.
Batman
A unit of weight established in 1931 equal to 10 kg.
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Batman
A Turkish unit of weight varying by location, time, and item from 2–8 okas (about 2.5–10 kg).
Batman
To act as a batman, wait on an officer.
Batman
To climb up or down a rope free hand (i.e. as Batman does).
Batman
A weight used in the East, varying according to the locality; in Turkey, the greater batman is about 157 pounds, the lesser only a fourth of this; at Aleppo and Smyrna, the batman is 17 pounds.
Batman
A man who has charge of a bathorse and his load.
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Batman
An orderly assigned to serve a British military officer