wind gauge vs anemometer

wind gauge and anemometer both are nouns.

Word	Noun	Adjective	Verb	Adverb
wind gauge	Yes	No	No	No
anemometer	Yes	No	No	No

As nouns, wind gauge and anemometer are synonyms defined as:

wind gauge and anemometer: a gauge for recording the speed and direction of wind

Other synonyms of wind gauge include wind gage.

wind gauge (noun)	anemometer (noun)
a gauge for recording the speed and direction of wind	a gauge for recording the speed and direction of wind