kestrel
/ˈkestrəl/
/ˈkestrəl/
Synonym discussion
Sense: noun/1
Kestrel is the specific word for this small falcon, especially one people notice hovering over fields before it drops on prey. Falcon is broader and can refer to larger or faster birds in the same family. Hawk is also a broad everyday word for a hunting bird, but it does not suggest the same hovering behavior. Eagle usually means a much larger and more powerful bird. If you mean the small bird hanging in the air above open ground, kestrel is the most exact choice.