There aren't many synonyms for the word "Phylacteric," given that it is a relatively obscure word with a specific meaning. "Phylactery" is a more common word that means the same thing-that is, a small container or piece of jewelry carrying a religious or magical inscription. The word "amulet" is also related, referring to a charm or object that is worn for protection. However, these words do not capture the specific nuance of "Phylacteric." Other related concepts might include talismans, symbols, or magic spells-all of which might be used for similar purposes, such as warding off evil or promoting good luck.