The term "confirmed sire" refers to a male animal that has been proven to be the biological father of a litter or offspring. Synonyms for this term include "proven sire", "certified father", and "established stud". These phrases are often used in the breeding industry to describe the male animals with strong genetics that are sought after for producing high-quality offspring. Other related terms include "breeding bull", "stud horse", and "breeding ram". Overall, these synonyms emphasize the importance of selecting the right male animal for successful breeding and producing the next generation of healthy, high-performing offspring.