different between orlop vs orlos

English

From Middle English overlop (“deck of a single-decker”), from Middle Low German overlop (“which leaps overhead”).

orlop (plural orlops)

(nautical) The platform over the hold of a ship that makes up the fourth or lowest deck, hence in full called orlop deck, especially of a warship.

Webster's Seventh New Collegiate Dictionary, Springfield, Massachusetts, G.&C. Merriam Co., 1967
Page 12 of The Fortune of War, by Patrick O'Brian
OED 2nd edition 1989
CorPun - Glossary of Royal Navy terms

orlos

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