wind vane vs weathervane

wind vane and weathervane both are nouns.

Word	Noun	Adjective	Verb	Adverb
wind vane	Yes	No	No	No
weathervane	Yes	No	No	No

As nouns, wind vane and weathervane are synonyms defined as:

wind vane and weathervane: mechanical device attached to an elevated structure; rotates freely to show the direction of the wind

Other synonyms of wind vane include vane, weather vane.

wind vane (noun)	weathervane (noun)
mechanical device attached to an elevated structure; rotates freely to show the direction of the wind	mechanical device attached to an elevated structure; rotates freely to show the direction of the wind