nosology vs diagnostics

nosology and diagnostics both are nouns.

Word	Noun	Adjective	Verb	Adverb
nosology	Yes	No	No	No
diagnostics	Yes	No	No	No

As nouns, nosology and diagnostics are synonyms defined as:

nosology and diagnostics: the branch of medical science dealing with the classification of disease

nosology (noun)	diagnostics (noun)
the branch of medical science dealing with the classification of disease	the branch of medical science dealing with the classification of disease