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Hematologist (noun)
A scientist, usually a medical doctor, who specializes in hematology.
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Cardiologist (noun)
A physician who specializes in medical problems related to the heart.
Wiktionary
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Cardiologist (noun)
a doctor who specializes in the study or treatment of heart diseases and heart abnormalities
“if you have chest pains I suggest you see a cardiologist”
Oxford Dictionary