idea vs calculation

idea and calculation both are nouns.

Word	Noun	Adjective	Verb	Adverb
idea	Yes	No	No	No
calculation	Yes	No	No	No

As nouns, calculation is a hypernym of idea; that is, calculation is a word with a broader meaning than idea:

Other hypernyms of idea include computation, figuring, reckoning.

idea (noun)	calculation (noun)
the content of cognition; the main thing you are thinking about	the procedure of calculating; determining something by mathematical or logical methods
your intention; what you intend to do	problem solving that involves numbers or quantities
an approximate calculation of quantity or degree or worth	planning something carefully and intentionally
a personal view
(music) melodic subject of a musical composition