high bar vs gymnastic apparatus

high bar and gymnastic apparatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
high bar	Yes	No	No	No
gymnastic apparatus	Yes	No	No	No

As nouns, gymnastic apparatus is a hypernym of high bar; that is, gymnastic apparatus is a word with a broader meaning than high bar:

high bar: gymnastic apparatus consisting of a bar supported in a horizontal position by uprights at both ends
gymnastic apparatus: sports equipment used in gymnastic exercises

Other hypernyms of high bar include exerciser.

high bar (noun)	gymnastic apparatus (noun)
gymnastic apparatus consisting of a bar supported in a horizontal position by uprights at both ends	sports equipment used in gymnastic exercises