fourth power vs biquadrate

fourth power and biquadrate both are nouns.

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

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

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

Other synonyms of fourth power include biquadratic, quartic.

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