rounding vs misreckoning

rounding and misreckoning both are nouns.

Word	Noun	Adjective	Verb	Adverb
rounding	Yes	No	No	No
misreckoning	Yes	No	No	No

As nouns, misreckoning is a hypernym of rounding; that is, misreckoning is a word with a broader meaning than rounding:

rounding: (mathematics) a miscalculation that results from rounding off numbers to a convenient number of decimals
misreckoning: a mistake in calculating

Other hypernyms of rounding include miscalculation, misestimation.

rounding (noun)	misreckoning (noun)
(mathematics) a miscalculation that results from rounding off numbers to a convenient number of decimals	a mistake in calculating