quartic vs biquadrate

quartic and biquadrate both are nouns.

Word	Noun	Adjective	Verb	Adverb
quartic	Yes	No	No	No
biquadrate	Yes	No	No	No

As nouns, quartic and biquadrate are synonyms defined as:

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

Other synonyms of quartic include biquadratic, fourth power.

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