How many letters does the top answer for “(nautical) an associate with whom you share meals in the same mess (as on a ship)” have?

The most common answer is messmate (8 letters).

Crossword clue: (nautical) an associate with whom you share meals in the same mess (as on a ship)

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

messmate 8 letters wn-def

(nautical) an associate with whom you share meals in the same mess (as on a ship)

an associate on the same ship with you 50% similar → shipmate