weathercock vs wind vane

weathercock and wind vane both are nouns.

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

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

weathercock: weathervane with a vane in the form of a rooster
wind vane: mechanical device attached to an elevated structure; rotates freely to show the direction of the wind

Other hypernyms of weathercock include vane, weather vane, weathervane.

weathercock (noun)	wind vane (noun)
weathervane with a vane in the form of a rooster	mechanical device attached to an elevated structure; rotates freely to show the direction of the wind