reckoning vs numeration

reckoning and numeration both are nouns.

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

As nouns, reckoning and numeration are synonyms defined as:

reckoning and numeration: the act of counting; reciting numbers in ascending order

Other synonyms of reckoning include count, counting, enumeration, tally.

reckoning (noun)	numeration (noun)
the act of counting; reciting numbers in ascending order	the act of counting; reciting numbers in ascending order
problem solving that involves numbers or quantities	naming numbers
a bill for an amount due