Which word names both a vacation on a ship and a type of missile?

Which word goes before "star", "sequoia" and "slalom"? In a quesadilla, "queso" is Spanish for what? Which optical instrument has a type named for Johannes Kepler? Which name belongs to both a class of U.S. attack submarines and a 1904 Jack London novel? What is a wide, triangular necktie knot called? How many sides does a typical snowflake have? Which number of degrees means a U-turn or a complete reversal of opinion? Which unit used in commerce equals 42 gallons of crude oil?