There are several synonyms for the word "dead" such as lifeless, deceased, expired, departed, and perished. Lifeless is used to describe something that has no life or vitality, while deceased is a more formal way of referring to someone who has passed away. Expired refers to something that has come to an end, such as an agreement or a subscription, and departed is used to describe someone who has left this world. Finally, perished means to die in a violent or sudden manner, often as a result of an accident or natural disaster. All of these words can be used as alternatives to the word "dead" in different contexts depending on the situation.