Sika is a term used to describe a type of deer that is native to East Asia. However, there are many synonyms for sika that are often used interchangeably. Some of the most commonly used synonyms for sika include Japanese deer, spotted deer, and stags. Other synonyms include elk, mule deer, red deer, and Fallow deer. While these terms may all refer to different types of deer, many people use them to describe sika or other similar deer species. Whatever term you use, it is important to understand the unique characteristics of the deer you are referring to and to use the appropriate terminology.