Yes, fiber is a Scrabble word!

Noun

1. A slender and greatly elongated substance capable of being spun into yarn

2. Coarse, indigestible plant food low in nutrients; its bulk stimulates intestinal peristalsis

3. Any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber)

4. The inherent complex of attributes that determines a persons moral and ethical actions and reactions

5. A leatherlike material made by compressing layers of paper or cloth