Crossword clues for the word: FOS The word FOS has appeared as an answer to at least 8 crossword clues on different crossword puzzles. Crossword clues for FOS Showing 1 to 8 of 8 results Clue(s) "Rhode Island Reds, e.g." Book leaves: Abbr. Decade of Elvis and Eisenhower Large books: Abbr. Offices for international affairs: Abbr. Page nos. Page numbers: Abbr. Plane-crew members: Abbr.