Why is it sometimes difficult to determine the exact meaning of words used in inscriptions?

Some words are specific to a particular place or time

It is evident that epigraphy has its limitations in revealing historical information. One significant constraint lies in technical factors, such as faintly engraved letters that lead to uncertain reconstructions. Moreover, inscriptions can suffer damage over time, resulting in missing letters or sections. Additionally, determining the precise meaning of words used in inscriptions can be challenging, especially when they are specific to particular places or time periods.