The term "cotton reel" is used to describe a small, cylindrical object that is used to hold thread or other materials for sewing and crafting. Synonyms for this term include "thread spool," "bobbin," "spindle," and "reel." These words are commonly used in crafting and sewing circles to describe the same type of object, and can be used interchangeably depending on the context. Other similar terms that may be used to describe this object include "yarn ball" and "skein," which are used specifically in reference to materials made from wool or other fibers.