秘

秘方 mìfāng HSK 7 #8,132

secret recipe / secret formula

秘密 mìmì HSK 4 #649

secret / confidential

神秘 shénmì HSK 4 #1,930

mysterious / mystical

秘诀 mìjué HSK 7 #8,873

secret (to success) / key (tip or trick) / knack

秘书 mìshū HSK 4 #3,796

secretary

隐秘 yǐnmì #9,952

secret; hidden; covert / concealed; private

奥秘 àomì HSK 7 #16,321

secret / mystery / profound secret

秘籍 mìjí #26,860

secret manual / rare book with esoteric knowledge / cheat code (in video games)

便秘 biànmì #14,854

constipation

秘书长 mìshūzhǎng #17,948

secretary-general