vane vs rudder blade

vane and rudder blade both are nouns.

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

As nouns, rudder blade is a hyponym of vane; that is, rudder blade is a word with a more specific, narrower meaning than vane:

Other hyponyms of vane include fan blade, impeller, paddle.

vane (noun)	rudder blade (noun)
the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft	the vertical blade on a rudder
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