high-voltage vs high-energy

high-voltage and high-energy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
high-voltage	No	Yes	No	No
high-energy	No	Yes	No	No

As adjectives, high-voltage and high-energy are synonyms defined as:

Other synonyms of high-voltage include high-octane, high-power, high-powered.

high-voltage (adjective)	high-energy (adjective)
vigorously energetic or forceful	of or relating to elementary particles having energies of hundreds of thousands of electron volts
operating on or powered by a high voltage	vigorously energetic or forceful
	providing a relatively large amount of energy upon undergoing a chemical reaction