Expert
Definition 1 of 4
Pro Tip 1/2
Subject Specific
Use 'expert' when referring to a person's deep understanding of a particular topic. A chess expert can anticipate moves many turns ahead.
Pro Tip 2/2
Not a Beginner
'Expert' implies a high level of proficiency, more than just a hobbyist or amateur. Only an expert in linguistics can decipher this manuscript.