high-octane vs high-power

high-octane and high-power both are adjectives.

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

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

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

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