* Adjective: When describing something as being related to or resembling hieroglyphics.
* Example: "The ancient Egyptians used a hieroglyphic writing system."
* Noun: When referring to the writing system itself or to a specific symbol within the system.
* Example: "The hieroglyphics on the sarcophagus told the story of the pharaoh's life."
So, the specific part of speech depends on how the word is used in the sentence.