Specialist (Noun)

An expert who is devoted to one occupation or branch of learning.

Nouns denoting people.

She was a specialist in child psychology with many years of experience working with children who have autism.
He became a specialist in renewable energy and traveled the world helping companies to switch to solar and wind power.
As a specialist in cardiovascular disease, the doctor spent many hours researching new treatments and speaking at conferences.
After years of working as a chef, she became a specialist in vegan cuisine and wrote a bestselling cookbook.
He was a specialist in artificial intelligence and machine learning, and was recruited by a top tech company to lead their innovation team.

Practices one branch of medicine.

Nouns denoting people.

She is a specialist in cardiology and has written several books on the subject.
The hospital has a specialist in infectious diseases who has been treating patients with COVID-19.
After completing his residency, he decided to become a specialist in pediatric surgery.
The doctor is a specialist in dermatology and has a thriving practice in the city.
She went to see a specialist in gastroenterology to get a second opinion on her diagnosis.