In the last stage of ancient Egyptian language, the Greeks began to adapt their own alphabet to writing ancient Egyptian, which caused a shift in the name of the language. It was now called Coptic.
The Greek alphabetic signs were supplemented with seven demotic signs to represent sounds that were not found in Greek. These letters expressed the sounds "Sh," "F," "H," "G," "Ch," and "T," that had no equivalent in Greek. Certain letters, such as the fluid letters "L," "M," "N," and "R were used interchangeably.
For example, the word "Nes" meaning "tongue" became "Les." There were several differences between Coptic and ancient Egyptian scripts. Coptic was written using both consonants and vowels, whereas the older scripts only consisted of consonants.