[{"Bold_text": "noun", "List Items": ["a person who has special skill or knowledge in some particular field; specialist; authority:a language expert.Synonyms: master , connoisseur", "Military.the highest rating in rifle marksmanship, above that of marksman and sharpshooter.a person who has achieved such a rating.", "the highest rating in rifle marksmanship, above that of marksman and sharpshooter.", "a person who has achieved such a rating."]}, {"Bold_text": "adjective", "List Items": ["possessing special skill or knowledge; trained by practice; skillful or skilled (often followed byinorat):an expert driver;to be expert at driving a car.Synonyms: dexterous , proficient , experienced Antonyms: unskillful", "pertaining to, coming from, or characteristic of an expert:expert work;expert advice."]}, {"Bold_text": "verb (used with object)", "List Items": ["to act as an expert for."]}]