And geometry is from the Greek γῆ (gê) 'earth, land', and μέτρον (métron) 'a measure', referring to it's original use as a tool for surveying farm plots in flood plains. It's obviously expanded much past that original definition to the point now that the original definition is simply one small application of the tool. In fact an application that the vast majority of practitioners will never administer.

Names change much slower the function generally.