biquadrate vs fourth power

biquadrate and fourth power both are nouns.

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

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

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

Other synonyms of biquadrate include biquadratic, quartic.

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