Here are some other words that can be used to describe a prolonged period of deep unconsciousness, depending on the context:
* Stupor: A state of near-unconsciousness, often caused by drugs, alcohol, or illness.
* Lethargy: A state of extreme weariness or lack of energy, often accompanied by a decreased level of consciousness.
* Vegetative state: A state of wakefulness without awareness, often caused by brain damage.
* Brain death: A complete and irreversible cessation of brain function.
It's important to note that the specific definition of each word can vary depending on the context.