Formal:
* Expert: This is a general term for someone with a high level of knowledge and skill in a particular field.
* Master: This implies exceptional proficiency and skill, often achieved through years of dedicated practice.
* Virtuoso: This term is often used for musicians, but can also be used for anyone who demonstrates exceptional technical skill and artistry.
* Prodigy: This is used for someone who demonstrates extraordinary talent at an unusually young age.
* Genius: This term is often used for someone with exceptional intellectual ability and creativity.
Informal:
* Gifted: This implies natural talent and aptitude for a particular skill.
* Talented: This is a general term for someone who is good at something.
* Skilled: This emphasizes the practical abilities and knowledge of someone.
* Masterful: This indicates a high level of control and precision in performing a skill.
* Wizard: This is a more playful term for someone who is incredibly good at something, particularly in areas like technology or problem-solving.
Other:
* Maverick: This term describes someone who is unconventional and unique in their approach to their skills.
* Innovator: This describes someone who develops new techniques and approaches within their field.
* Pioneer: This term is used for someone who is one of the first to develop a new skill or field.
The best term to use will depend on the specific context and the type of skills the person possesses.