cytology vs microscopic anatomy

cytology and microscopic anatomy both are nouns.

Word	Noun	Adjective	Verb	Adverb
cytology	Yes	No	No	No
microscopic anatomy	Yes	No	No	No

As nouns, microscopic anatomy is a hypernym of cytology; that is, microscopic anatomy is a word with a broader meaning than cytology:

cytology: the branch of biology that studies the structure and function of cells
microscopic anatomy: the study of microscopic structures of tissues and organs

Other hypernyms of cytology include biological science, biology.

cytology (noun)	microscopic anatomy (noun)
the branch of biology that studies the structure and function of cells	the study of microscopic structures of tissues and organs