@Noemi
Languages are not "sisters" many are completely unconnected, there is no similarity for example between Arabic and Japanese, or Romanian and Persian. Even in languages that are superficially connect by common roots mixing words from two or more languages in a single sentence when neither have been commonly accepted in to the parlance of the other is simply pretentious at best.
to address your examples

Agronomy has a purely Greek etymology Agros (land) and Nomos (arranging) and has been accepted in to most European languages as a co-opted word.

There is no such word as presocratism it is a poor translation for the correct word Presocratic originating in some very poor translations of Heidegger.

However Presocratic is in itself a hybrid word, something I shall address as you are I believe talking about portmanteau hybrid words, usually created out of ignorance and a poor understanding of linguistics
For Example
Television from the Greek Tele and the latin Vidi meaning distance and to be seen respectively or
Vexillology – from the Latin vexillum, meaning "flag", and the Greek logia, meaning "study"

Such words that have nonetheless entered the mainstream, usually as brand names or by other popular means.

I believe, therefore my original criticism is valid, as is my correction.