Yes but it's a measure of _volume_, whereas flour is best measured by _weight_. Any volume measurement of flour can vary wildly depending on many factors, such as how densely packed it is.
King Arthur Flour have a short video[0] demonstrating the wildly different weight measurements from measuring a "cup" (the same cup size across samples).
Measuring liquids by volume is totally fine because you generally won't get a large difference between two different cups of water (although I still generally measure that by weight as a personal preference).