Ebbing flowing is a phrase that describes the natural movement of waves in a body of water. There are alternative terms that can be used to describe this movement, including surging, oscillating, or undulating. Alternatively, the phrase can be split into two distinct words, which allows for even more synonyms to be used. For "ebbing," words like receding, waning, or diminishing could be used. For "flowing," terms such as surging, inundating, or coursing could be used. Depending on the specific context, different synonyms may be more appropriate to convey the intended meaning of the text.