I have a question while reading an GRE passage. To help your understanding, i put the whole passage below.
Whether the languages of the ancient American peoples were used for expressing abstract universal concepts can be clearly answered in the case of Nahuatl. Nahuatl, like Greek and German, is a language that allows the formation of extensive compounds. By the combination of radicals or semantic elements, single compound words can express complex conceptual relations, often of an abstract universal character.
The tlamatinime (those who know) were able to use this rich stock of abstract terms to express the nuances of their thought. They also availed themselves of other forms of expression with metaphorical meaning, some probably original, some derived from Toltec coinages. Of these forms, the most characteristic in Nahuatl is the juxtaposition of two words that, because they are synonyms, associated terms, or even contraries, complement each other to evoke one single idea. Used metaphorically, the juxtaposed terms connote specific or essential traits of the being they refer to, introducing a mode of poetry as an almost habitual form of expression.
My question is about a bold sentence. I understand that some in the sentence indicated 'the forms of expression'. May I consider 'the forms of expression' as ' the formation of compound words'? In answer sheet, 'the forms of expression' is only treated as just 'expression'. Is that right?
Is there any difference between 'forms of expression' and 'expression'?