The term GREEN ONE can be broken down into four crossword solutions: NAIF (4 letters), TYRO (4 letters), NEWBIE (6 letters), and ENVIER (6 letters). NAIF is a French word meaning naive or innocent. TYRO is a Greek word meaning beginner or novice. NEWBIE is a slang term for someone who is new to a particular activity or situation. ENVIER is a French word meaning one who desires something that another has. All four words refer to someone who is inexperienced or new to a certain situation.