"Ebb flows" is an expression that refers to the recurring movement of tides. It is usually used to describe the constant changes in a situation or circumstance. There are several synonyms that can be used instead of "ebb flows," such as fluctuation, oscillation, variation, and instability. Fluctuation refers to a change in something's balance, while oscillation implies a regular and repeated movement back and forth. Variation suggests a change in a particular aspect of something, while instability connotes a shift from one state to another, often resulting in a degree of uncertainty or unpredictability. All these synonyms can be used in place of "ebb flows" to convey the idea of continuous change and fluidity.