Crossword clues for the word: NMU The word NMU has appeared as an answer to at least 6 crossword clues on different crossword puzzles. Crossword clues for NMU Showing 1 to 6 of 6 results Clue(s) Marquette campus Marquette sch. Sea union: Abbr. Seamen's group: Abbr. Seamen's org. Upper Peninsula sch.