diagnosis vs urinalysis

diagnosis and urinalysis both are nouns.

Word	Noun	Adjective	Verb	Adverb
diagnosis	Yes	No	No	No
urinalysis	Yes	No	No	No

As nouns, urinalysis is a hyponym of diagnosis; that is, urinalysis is a word with a more specific, narrower meaning than diagnosis:

diagnosis: identifying the nature or cause of some phenomenon
urinalysis: (medicine) the chemical analysis of urine (for medical diagnosis)

Other hyponyms of diagnosis include blood typing, medical diagnosis, uranalysis.

diagnosis (noun)	urinalysis (noun)
identifying the nature or cause of some phenomenon	(medicine) the chemical analysis of urine (for medical diagnosis)