NOTE: always implies a specialty in some field of medicine.
NOTE: GPs are considered to be professionals, experts, but not specialists (so a bit different from Sense 2)
He is seeing one of the best heart specialists in Houston.
The child should be examined by an ear specialist.
We could not find a specialist in this particular psychiatric disorder.
WordNet 3.0 Sense Numbers: 2
NOTE: implies deep knowledge on some topic, usually a narrow topic.
They detectives brought in their fingerprint specialist.
Mary has become a specialist in 18th century Dutch blue ceramics.
We talked to a tea specialist who selected some rare Jasmine varieties for us.
WordNet 3.0 Sense Numbers: 1
He became a specialist 4, which is the rank of a corporal.
A sergeant first class is also a specialist 7, and does administrative work but does not exercise command.
WordNet 0.0 Sense Numbers: 2