The expression "terminological inexactitudes" is a euphemism for errors in language usage, and there are a number of synonyms that can be used to refer to the same concept. For instance, one could speak of "semantical errors," which are mistakes in the meaning of words or phrases. Or one could use the term "lexicographical errors," which refer to mistakes in grammar or syntax. Other synonyms might include "linguistic blunders" or "vocabulary miscues." Ultimately, the choice of synonym will depend on the situation and the context, as well as the speaker's personal style and preferences.