reckon vs reckoning

reckon is not a noun while reckoning is a noun.

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

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

reckon (verb)	reckoning (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