What does the text say about the expression كَلِمَةٌ بَلِيغَةٌ?

Fasaha and Balagha: Linguistic Meanings, Divisions, and Word-level Foundations

• It is required of every word
• It is the name of a poetic form
• It is not an attested technical attribution in the usage discussed
• It is exactly synonymous with kalima fasiha