Breeding stock refers to the group of animals used for the purpose of reproduction and maintaining the genetic characteristics of a particular species. However, there are various synonyms to describe this type of stock. For instance, "purebred" refers to animals that have been selectively bred to possess specific traits, while "pedigree" refers to the lineage of a particular breed. Some other synonyms for breeding stock include "foundation stock," "stud animals," and "breeders." These terms all describe animals that are chosen for their genetic qualities and are used to improve the overall genetic makeup of a particular breed or species.