Synonyms for Fiber (same or very similar meaning)
WordNet sense 1 (a slender and greatly elongated solid substance):
fibreWordNet sense 2 (the inherent complex of attributes that determine a persons moral and ethical actions and reactions):
characterWordNet sense 3 (a leatherlike material made by compressing layers of paper or cloth):
vulcanized fiberFrom the ODE community, based on WordNetadd/edit