high-voltage vs high-octane

high-voltage and high-octane both are adjectives.

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

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

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

high-voltage (adjective)	high-octane (adjective)
vigorously energetic or forceful	vigorously energetic or forceful
operating on or powered by a high voltage	used of gasoline; having a high octane number