reckoning vs investigation

reckoning and investigation both are nouns.

Word	Noun	Adjective	Verb	Adverb
reckoning	Yes	No	No	No
investigation	Yes	No	No	No

As nouns, investigation is a hypernym of reckoning; that is, investigation is a word with a broader meaning than reckoning:

reckoning: the act of counting; reciting numbers in ascending order
investigation: the work of inquiring into something thoroughly and systematically

Other hypernyms of reckoning include investigating.

reckoning (noun)	investigation (noun)
the act of counting; reciting numbers in ascending order	the work of inquiring into something thoroughly and systematically
problem solving that involves numbers or quantities	an inquiry into unfamiliar or questionable activities
a bill for an amount due