different between athwartships vs yardarm

English

From athwart (“across”) + ship + -s as an adverbial ending.

athwartships (not comparable)

(nautical) Across the vessel sideways, i.e. in a direction at right angles to the fore-and-aft line of the vessel.
- 1851, Herman Melville, Moby-Dick, New York: Harper, Chapter 107, p. 519,^[1]
  At all times except when whales were alongside, this bench was securely lashed athwartships against the rear of the Try-works.

yard +? arm

yardarm (plural yardarms)

(nautical) The outer end of a yard, often equipped with blocks for reeving signal halyards.

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