biquadratic polynomial vs biquadratic

biquadratic polynomial and biquadratic both are nouns.

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

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

biquadratic polynomial and biquadratic: a polynomial of the fourth degree

Other synonyms of biquadratic polynomial include quartic polynomial.

biquadratic polynomial (noun)	biquadratic (noun)
a polynomial of the fourth degree	a polynomial of the fourth degree
	an equation of the fourth degree
	an algebraic equation or function of the fourth degree

biquadratic polynomial (adjective)	biquadratic (adjective)
	involving the fourth and no higher power of a quantity or degree