Early Quenya
kiryassea
adjective. what is on board ship
kirya
noun. ship, boat
lunte
noun. ship, boat
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
An adjective appearing as ᴱQ. kiryassea “what is on board ship” in the Early Qenya Grammar of the 1920s, an example of a how adjectives can be formed from the locative (PE14/47, 79).
Neo-Quenya: This construction remains valid in Tolkien’s later Quenya, such as 1950s menelessea “✱in heaven” (VT43/13). Thus, I would keep ᴺQ. ciryassëa as an adjective meaning “✱ship-board, on-board” referring to things on a ship, for example: ciryassëa sorasta “ship-board/on-board equipment”. For “on board” as a location, the ordinary locative would be used (PE14/46; PE15/70), for example: á mene ciryassë “go aboard/on board [= on ship]”.