augury vs prognostic

augury and prognostic both are nouns.

Word	Noun	Adjective	Verb	Adverb
augury	Yes	No	No	No
prognostic	Yes	Yes	No	No

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

Other hyponyms of augury include war cloud, omen, portent, presage, prodigy, prognostication.

augury (noun)	prognostic (noun)
an event that is experienced as indicating important things to come	a sign of something about to happen

augury (adjective)	prognostic (adjective)
	of or relating to prediction; having value for making predictions