high-power vs high-octane

high-power and high-octane both are adjectives.

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

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

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

high-power (adjective)	high-octane (adjective)
vigorously energetic or forceful	vigorously energetic or forceful
	used of gasoline; having a high octane number