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Synonyms for Vane (same or very similar meaning)

WordNet sense 1 (mechanical device attached to an elevated structure; rotates freely to show the direction of the wind):
weathervane, wind vane

WordNet sense 2 (flat surface that rotates and pushes against air or water):
blade

WordNet sense 3 (the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft):
web


From the ODE community, based on WordNetadd/edit