Specialist
Part of speech: adjective
Definition: Specialised.
Part of speech: noun
Definition: Someone who is an expert in, or devoted to, some specific branch of study or research. A physician whose practice is limited to a particular branch of medicine or surgery. Any of several non-commissioned ranks corresponding to that of corporal.
Analyst
Part of speech: noun
Definition: someone who analyzesa mathematician who studies real analysisa systems analysta practitioner of psychoanalysisa chemical analyst; a financial analyst; a business analyst