quartic polynomial vs biquadratic polynomial

quartic polynomial and biquadratic polynomial both are nouns.

Word	Noun	Adjective	Verb	Adverb
quartic polynomial	Yes	No	No	No
biquadratic polynomial	Yes	No	No	No

As nouns, quartic polynomial and biquadratic polynomial are synonyms defined as:

quartic polynomial and biquadratic polynomial: a polynomial of the fourth degree

Other synonyms of quartic polynomial include biquadratic.

quartic polynomial (noun)	biquadratic polynomial (noun)
a polynomial of the fourth degree	a polynomial of the fourth degree