The word of God is not just the written word...AND it's not just the spoken word. The Greek word for "word" is logos. In Greek philosophy, Heracleitus, Plato and Aristotle agreed on the basic meaning of logos, which is; the divine reason implicit in the cosmos, ordering it and giving it form and meaning.

Essentially, the Logos was the order and structure behind nature. Philosophers for thousands of years have looked at nature and recognized there's an order to things; a tree bears fruit, rainwater nourishes the plants, humans are sustained by the food that grows, etc...