weathervane vs wind vane

weathervane and wind vane both are nouns.

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

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

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

Other synonyms of weathervane include vane, weather vane.

weathervane (noun)	wind vane (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