second-guess vs prognosticate

second-guess and prognosticate both are verbs.

Word	Noun	Adjective	Verb	Adverb
second-guess	No	No	Yes	No
prognosticate	No	No	Yes	No

As verbs, prognosticate is a hypernym of second-guess; that is, prognosticate is a word with a broader meaning than second-guess:

Other hypernyms of second-guess include anticipate, call, forebode, foretell, predict, promise.

second-guess (verb)	prognosticate (verb)
evaluate or criticize with hindsight	make a prediction about; tell in advance
attempt to anticipate or predict	indicate, as with a sign or an omen