reckoning vs reckon

reckoning is a noun but reckon is not a noun.

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

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

reckoning (verb)	reckon (verb)
	deem to be
	make a mathematical calculation or computation
	expect, believe, or suppose
	judge to be probable
	have faith or confidence in
	take account of