histologist vs anatomist

histologist and anatomist both are nouns.

Word	Noun	Adjective	Verb	Adverb
histologist	Yes	No	No	No
anatomist	Yes	No	No	No

As nouns, anatomist is a hypernym of histologist; that is, anatomist is a word with a broader meaning than histologist:

histologist: anatomist who specializes in the microscopic study of animal tissues
anatomist: an expert in anatomy

histologist (noun)	anatomist (noun)
anatomist who specializes in the microscopic study of animal tissues	an expert in anatomy