diagnose vs study

diagnose is not a noun while study is a noun.

Word	Noun	Adjective	Verb	Adverb
diagnose	No	No	Yes	No
study	Yes	No	Yes	No

As verbs, study is a hypernym of diagnose; that is, study is a word with a broader meaning than diagnose:

diagnose: determine or distinguish the nature of a problem or an illness through a diagnostic analysis
study: consider in detail and subject to an analysis in order to discover essential features or meaning

Other hypernyms of diagnose include analyse, analyze, canvass, examine.

As verbs, study is a hypernym of diagnose; that is, study is a word with a broader meaning than diagnose:

diagnose: subject to a medical analysis
study: consider in detail and subject to an analysis in order to discover essential features or meaning

Other hypernyms of diagnose include analyse, analyze, canvass, examine.

diagnose (noun)	study (noun)
	a detailed critical inspection
	a room used for reading and writing and studying
	preliminary drawing for later elaboration
	attentive consideration and meditation
	a branch of knowledge
	applying the mind to learning and understanding a subject (especially by reading)
	a state of deep mental absorption
	a written document describing the findings of some individual or group
	a composition intended to develop one aspect of the performer's technique
	someone who memorizes quickly and easily (as the lines for a part in a play)

diagnose (verb)	study (verb)
determine or distinguish the nature of a problem or an illness through a diagnostic analysis	be a student of a certain subject
subject to a medical analysis	learn by reading books
	consider in detail and subject to an analysis in order to discover essential features or meaning
	be a student; follow a course of study; be enrolled at an institute of learning
	think intently and at length, as for spiritual purposes
	give careful consideration to