秘書【ひしょ】
(private) secretary, treasured book, secret book
秘密【ひみつ】
secret, secrecy, confidentiality, privacy, mystery, secret (e.g. to success), esoteric teachings
神秘【しんぴ】
mystery, mysteriousness, secret
便秘【べんぴ】
constipation
秘める【ひめる】
to hide, to keep to oneself
黙秘権【もくひけん】
right to keep silent, right to silence, right to remain silent
秘訣【ひけつ】
secret (method, trick, etc.), key (e.g. to success), mysteries (of an art, trade, etc.), recipe, trick