General:
* Existence: This is the most straightforward synonym, simply meaning the state of being alive.
* Being: This is a more philosophical term, suggesting the totality of a living creature.
* Life-span: This focuses on the duration of existence.
* Experience: This emphasizes the events and happenings of a life.
More Specific:
* Biosphere: This refers to the realm of all living things on Earth.
* Vitality: This emphasizes the energy and vigor of life.
* Spirit: This suggests the animating force within a living being.
* Journey: This focuses on the path and experiences of a life.
Ultimately, the best synonym for "life" depends on the specific context and the nuance you want to convey.