極秘: absolutely secret, top secret

極秘: total secrecy

a hand / a handle, grip / a paw, foreleg / a way of acting, means / (board games) a move, play

the mon, an old currency / a unit of length for measuring the size of one's foot (from the way that the mon coins would be lined up and used as a kind of inch marker) / a character, a letter

The hiragana syllable ひゅ (hyu). Its equivalent in katakana is ヒュ (hyu).

(onomatopoeia) whistling of the wind, a flute, or flying by of a ghost, etc.

secret; confidential

absolutely secret, top secret

total secrecy

pole (eg. North Pole); extremity, zenith / quindecillion