heart specialist vs heart surgeon

heart specialist and heart surgeon both are nouns.

Word	Noun	Adjective	Verb	Adverb
heart specialist	Yes	No	No	No
heart surgeon	Yes	No	No	No

As nouns, heart specialist and heart surgeon are synonyms defined as:

heart specialist and heart surgeon: a specialist in cardiology; a specialist in the structure and function and disorders of the heart

Other synonyms of heart specialist include cardiologist.

heart specialist (noun)	heart surgeon (noun)
a specialist in cardiology; a specialist in the structure and function and disorders of the heart	a specialist in cardiology; a specialist in the structure and function and disorders of the heart