different between decuman vs deckman

English

From Latin decum?nus (“of the tenth, and by metonymy, large”), from decem (“ten”).

decuman (not comparable)

(obsolete) large; chief; applied to an extraordinary billow, supposed by some to be every tenth in sequence.
- c. 1870, Frederic Farrar, The witness of history to Christ; 5 sermons, being the Hulsean lects. for 1870
  decuman billows
(historical) Connected with the principal gate of an Ancient Roman camp, near which the tenth cohort of the legion was stationed.

decuman (plural decumans)

(obsolete) An extraordinarily large billow.
- 1870, James Russell Lowell, The Cathedral
  the baffled decuman

deck +? -man

deckman (plural deckmen)

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