rudder blade vs vane

rudder blade and vane both are nouns.

Word	Noun	Adjective	Verb	Adverb
rudder blade	Yes	No	No	No
vane	Yes	No	No	No

As nouns, vane is a hypernym of rudder blade; that is, vane is a word with a broader meaning than rudder blade:

Other hypernyms of rudder blade include blade.

rudder blade (noun)	vane (noun)
the vertical blade on a rudder	the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft
	mechanical device attached to an elevated structure; rotates freely to show the direction of the wind
	flat surface that rotates and pushes against air or water
	a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it