fan blade vs vane

fan blade and vane both are nouns.

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

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

Other hypernyms of fan blade include blade.

fan blade (noun)	vane (noun)
blade of a rotating fan	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