The word "spier" is a common word used to describe a type of bird. However, there are several synonyms that can also be used to describe these birds. Some of these words include kestrel, hawk, falcon, buzzard, and eagle. Each of these words can be used to describe different types of birds of prey, with kestrel being a smaller bird with a distinctive tail, and eagle being a larger bird with a powerful wingspan. Using synonyms for the word "spier" can help to add variety to your writing, making it more interesting and engaging for readers.