Fluctuability is a term often used to describe the ability of something to fluctuate or vary. However, when seeking alternative synonyms for this word, there are several options available. One suitable alternative is "volatility", which highlights the tendency of something to change rapidly or unpredictably. Another synonym worth considering is "instability", emphasizing the lack of consistency or balance. Additionally, "variability" can be used to convey the idea of fluctuation or changeability. Lastly, "oscillation" is a suitable synonym, specifically referring to a back-and-forth movement or change. These synonyms provide alternative ways to describe the concept of fluctuability, offering flexibility and precision in word choice.