Synonyms for Blade (same or very similar meaning)
WordNet sense 1 (especially a leaf of grass or the broad portion of a leaf as distinct from the petiole):
leaf bladeWordNet sense 2 (a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard):
brand, steel, swordWordNet sense 3 (flat surface that rotates and pushes against air or water):
vaneFrom the ODE community, based on WordNetadd/edit