biquadratic vs biquadratic polynomial

biquadratic and biquadratic polynomial both are nouns.

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

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

biquadratic and biquadratic polynomial: a polynomial of the fourth degree

Other synonyms of biquadratic include quartic polynomial.

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