anemometer vs wind gauge

anemometer and wind gauge both are nouns.

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

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

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

Other synonyms of anemometer include wind gage.

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