Bush-leaguer is a term commonly used in sports when describing an athlete who lacks the skills or experience to play at a professional level. Some common synonyms for bush-leaguer include amateur, novice, beginner, inexperienced, greenhorn, unskilled, or untrained. These terms imply that the person in question has little expertise or proficiency in their field, and may often make mistakes or lack confidence. Another more slang term is "wannabe," which denotes someone who aspires to be more than they are currently capable of achieving. Nonetheless, regardless of the terminology used, all these words convey the same basic meaning of a person who has yet to reach the highest level of achievement in their chosen field.