disappearance · noun C or U /ˌdɪs.əˈpɪr.əns/Full view
Nouns: appearance, disappearance
Verbs: appear, disappear
B2 when someone or something disappears
Dictionary example:

A man was being questioned in connection with her disappearance.

Learner example:

After his disappearance lots of people were looking for him and [in] the end they tracked him down! (First Certificate in English; B2; Italian)

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