rounding error vs rounding

rounding error and rounding both are nouns.

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

As nouns, rounding error and rounding are synonyms defined as:

rounding error and rounding: (mathematics) a miscalculation that results from rounding off numbers to a convenient number of decimals

rounding error (noun)	rounding (noun)
(mathematics) a miscalculation that results from rounding off numbers to a convenient number of decimals	(mathematics) a miscalculation that results from rounding off numbers to a convenient number of decimals