As "neither linguistically conceived experience nor speech-less experience," but rather as "the experience of the removal of the word" and in unity with the experience of the birth of the word," the "Ur-word" would correspond accordingly to the "Ur-sentence", [...]
Source: wiktionary
According to Hillis Miller, Hopkins supposed that, by a continuous process of subdivision, all words descend from a first original, an ur-word.
Source: wiktionary
Enowning, enabling saying (showing), makes way in clearing and opening ways for gathering-thinging. Heidegger in another work calls on an Ur-word from the East, bringing it into play with the thought of enowning.
Source: wiktionary