biquadratic polynomial vs quartic polynomial

biquadratic polynomial and quartic polynomial both are nouns.

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

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

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

Other synonyms of biquadratic polynomial include biquadratic.

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