保証書 ほしょうしょ Meanings Noun written guarantee; guarantee letter; warranty; warranty card Kanji 保 keep. Read as ホ. 証 proof. Read as ショウ. 書 write. Read as ショ. Words containing 保証書 身元保証書 (みもとほしょうしょ) personal reference letter Jinuma: Japanese Dictionary · Word lists