The term "full-grown wolf" refers to a wolf that has reached its maximum physical size and has matured into adulthood. There are several synonyms for this expression that underline the same meaning. For instance, a "fully matured wolf" or a "mature wolf" can be used as an alternative. Besides, the phrase "adult wolf" or "grown-up wolf" can be employed to avoid repetition. Another option could be "fully-developed wolf," which accentuates the idea of complete maturation. Lastly, the term "large wolf" or "big wolf" can also denote a full-grown specimen based on its substantial size compared to juvenile wolves.