computer error vs occurrence

computer error and occurrence both are nouns.

Word	Noun	Adjective	Verb	Adverb
computer error	Yes	No	No	No
occurrence	Yes	No	No	No

As nouns, occurrence is a hypernym of computer error; that is, occurrence is a word with a broader meaning than computer error:

computer error: (computer science) the occurrence of an incorrect result produced by a computer
occurrence: an event that happens

Other hypernyms of computer error include happening, natural event, occurrent.

computer error (noun)	occurrence (noun)
(computer science) the occurrence of an incorrect result produced by a computer	an event that happens
	an instance of something occurring