overrating vs overreckoning

overrating and overreckoning both are nouns.

Word	Noun	Adjective	Verb	Adverb
overrating	Yes	No	No	No
overreckoning	Yes	No	No	No

As nouns, overrating and overreckoning are synonyms defined as:

overrating and overreckoning: a calculation that results in an estimate that is too high

Other synonyms of overrating include overestimate, overestimation.

overrating (noun)	overreckoning (noun)
a calculation that results in an estimate that is too high	a calculation that results in an estimate that is too high