calculate vs prognosticate

calculate and prognosticate both are verbs.

Word	Noun	Adjective	Verb	Adverb
calculate	No	No	Yes	No
prognosticate	No	No	Yes	No

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

Other hypernyms of calculate include anticipate, call, forebode, foretell, predict, promise.

calculate (verb)	prognosticate (verb)
make a mathematical calculation or computation	make a prediction about; tell in advance
specifically design a product, event, or activity for a certain public	indicate, as with a sign or an omen
judge to be probable
have faith or confidence in
predict in advance
keep an account of