Identify the Russian words that have a spelling error related to a hard sign (ъ) or soft sign (ь).

Analysis of Spelling Errors:

The text mentions identifying an error in spelling where a hard sign (ъ) or soft sign (ь) should be. The phrase "разделительный твёрдый" (dividing hard sign) suggests the focus is on the correct usage of these signs to separate sounds or indicate softness.