delator meaning in English

whistle-blower [whistle-blowers]▼(one who reports a problem or violation to the authorities)
noun
[UK: ˈwɪs.l̩ ˈbləʊə(r)] [US: ˈwɪs.l̩ ˈbloʊə(r)]

fink [finks]▼(informer)
noun
[UK: ˈfɪŋk] [US: ˈfɪŋk]

informant [informants]▼(one who relays confidential information)
noun
[UK: ɪn.ˈfɔː.mənt] [US: ˌɪn.ˈfɔːr.mənt]

informer [informers]▼(person who tells authorities about improper or illegal activity)
noun
[UK: ɪn.ˈfɔː.mə(r)] [US: ˌɪn.ˈfɔːr.mər]