The term "staff of life" refers to something that is considered essential to a person's well-being or survival. It is commonly used to describe bread or other staple foods. However, there are many other words that can be used to describe this same concept. "Basic necessity" is a term often used to describe things that are essential for survival, such as food, water, and shelter. "Pillar of sustenance" or "staple" are other words that can be used to describe the same idea. Other synonyms for "staff of life" include "foundation," "cornerstone," and "mainstay." Regardless of what word is used, the importance of having basic necessities to survive cannot be overstated.