The ten letter word in an Anemometer, unless you are thinking of Wind Vane (which is two words)
· Accordion · Harmonica · Saxophone · Xylophone
Perhaps a flute or a pipe.
The anemometer is used to measure the wind. The word anemometer comes from the Greek word "anemos" which means wind.
A "wind instrument" is any musical instrument that you play by blowing into it. Examples include the trumpet, piccolo, ocarina, khalil, recorder, hautboi, jug, tuba, etc.
clarinet
mellophone (portable brass musical instrument)
WIND
stick
Euphonium
pincer?
Banjo