karaoke vs singing

karaoke and singing both are nouns.

Word	Noun	Adjective	Verb	Adverb
karaoke	Yes	No	No	No
singing	Yes	Yes	No	No

As nouns, singing is a hypernym of karaoke; that is, singing is a word with a broader meaning than karaoke:

karaoke: singing popular songs accompanied by a recording of an orchestra (usually in bars or nightclubs)
singing: the act of singing vocal music

Other hypernyms of karaoke include vocalizing.

karaoke (noun)	singing (noun)
singing popular songs accompanied by a recording of an orchestra (usually in bars or nightclubs)	the act of singing vocal music
	disclosing information or giving evidence about another

karaoke (adjective)	singing (adjective)
	smooth and flowing