high-power vs high-voltage

high-power and high-voltage both are adjectives.

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

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

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

high-power (adjective)	high-voltage (adjective)
vigorously energetic or forceful	vigorously energetic or forceful
	operating on or powered by a high voltage