A polynomial with two terms is called a binomial.
An expression with two terms is called a binomial.
A binomial is a polynomial with two terms.
this term 2x is not a polynomial. this term is a monomial. since only one term was listed it can not be a polynomial. A polynomial is like four or more terms. a trinomial is three terms and a binomial is two terms.
The only difference is that a binomial has two terms and a polynomial has three or more terms.
Two terms is a binomial. More than two terms is a polynomial. Binomials are not part of the set of polynomials.