carelessness vs nonperformance

carelessness and nonperformance both are nouns.

Word	Noun	Adjective	Verb	Adverb
carelessness	Yes	No	No	No
nonperformance	Yes	No	No	No

As nouns, carelessness and nonperformance are synonyms defined as:

carelessness and nonperformance: failure to act with the prudence that a reasonable person would exercise under the same circumstances

Other synonyms of carelessness include neglect, negligence.

carelessness (noun)	nonperformance (noun)
failure to act with the prudence that a reasonable person would exercise under the same circumstances	failure to act with the prudence that a reasonable person would exercise under the same circumstances
the quality of not being careful or taking pains