Normal deviation, also known as standard deviation, measures the amount of variation or dispersion in a set of data. There are several synonyms for standard deviation, including variability, scatter, dispersion and spread. Another synonym for normal deviation is error, which refers to the differences between a measured or observed value and the true or expected value. Additionally, normal deviation can be described as the degree to which data points deviate from the mean or average of the data set. Other synonyms for standard deviation can include fluctuation, variation, and diversity. Understanding the different synonyms for normal deviation can help individuals to effectively analyze and interpret data.