quartic vs fourth power

quartic and fourth power both are nouns.

Word	Noun	Adjective	Verb	Adverb
quartic	Yes	No	No	No
fourth power	Yes	No	No	No

As nouns, quartic and fourth power are synonyms defined as:

quartic and fourth power: an algebraic equation or function of the fourth degree

Other synonyms of quartic include biquadrate, biquadratic.

quartic (noun)	fourth power (noun)
an algebraic equation or function of the fourth degree	an algebraic equation or function of the fourth degree