Crossword clues for the word: PLUTON The word PLUTON has appeared as an answer to at least 7 crossword clues on different crossword puzzles. Crossword clues for PLUTON Showing 1 to 7 of 7 results Clue(s) "Label for rejected planets, itself rejected in August 2006" Igneous rock beneath the earth's surface Igneous rock far beneath the earth's surface Igneous rock that solidifies deep in the earth Mass of crystallized magma Rock mass within the earth (P.L.O. NUT anag.) Underground mass of igneous rock