different between manhandling vs derrickman

English

manhandling

manhandling (plural manhandlings)

The act of one who manhandles; rough physical treatment.
- 1986, Justice & Peace Review (volumes 1-7, page 13)
  The memory of harassments, threats and manhandlings, the fear brought by torture pricks painfully in his subconscious.

From derrick +? man.

derrickman (plural derrickmen)

A member of a oil drilling rig who works on a derrick suspended above the rig floor, manhandling the drillpipe.
- 2013, Philipp Meyer, The Son, Simon & Schuster 2014, p. 346:
  There was a movement high in the derrick; the derrickman had come off the monkey board; he was half jumping, half sliding down the ladder.

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