Dier is the Dutch word for animal. However, in the Dutch language, there are various other words that can be used as synonyms for dier. One of the most common synonyms is the word "beest," which can be used to refer to any type of animal, or even a person that is acting like an animal. Another synonym is "fauna," which specifically refers to the animal life in a particular area. "Creatuur" is another synonym that can be used, emphasizing the creature aspect of the animal rather than its zoological classification. Lastly, the word "wild" can also be used as a synonym for "dier," referring to animals that are not domesticated.