horizontal bar vs high bar

horizontal bar and high bar both are nouns.

Word	Noun	Adjective	Verb	Adverb
horizontal bar	Yes	No	No	No
high bar	Yes	No	No	No

As nouns, horizontal bar and high bar are synonyms defined as:

horizontal bar and high bar: gymnastic apparatus consisting of a bar supported in a horizontal position by uprights at both ends

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