* Life: This is the most common noun form, referring to the state of being alive and the experiences that come with it.
* Lives: This is the plural of "life", used when referring to multiple instances of living.
* Living: This can be a noun, referring to the act of being alive or the state of being alive.
* Live: This is occasionally used as a noun, especially in the context of a live performance or broadcast.
The best choice depends on the specific situation. For example:
* "She has a beautiful life."
* "They lost their lives in the accident."
* "We discussed the importance of living authentically."
* "We watched the live concert on TV."