Tiyanak is a folklore creature that originates from the Philippine mythology. It is believed to be a vengeful spirit of an aborted or murdered child. As a result, it has various synonyms in the Filipino language. Some of these synonyms include "tianak," "tiniente," "makamundong-anak," and "bata-batuta." These words are often used interchangeably with "tiyanak" depending on the region or dialect. Despite their differences in names, they all refer to the same mythical creature that is feared by many. As civilization progresses, the concept of tiyanak has become more of a cultural reference rather than a real belief, but it is still widely known in the Philippines as a scary figure to avoid.