invoice vs reckoning

invoice and reckoning both are nouns.

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

As nouns, reckoning is a hyponym of invoice; that is, reckoning is a word with a more specific, narrower meaning than invoice:

invoice: an itemized statement of money owed for goods shipped or services rendered
reckoning: a bill for an amount due

invoice (noun)	reckoning (noun)
an itemized statement of money owed for goods shipped or services rendered	the act of counting; reciting numbers in ascending order
	problem solving that involves numbers or quantities
	a bill for an amount due

invoice (verb)	reckoning (verb)
send a bill to