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A monomial is a number, a variable or the product of a number and one or more variables with non-negative integer exponents. The monomial has only one term.

A polynomial is a monomial or the sum of monomials, each called a term of the polynomial.

The polynomial having only one term is called a monomial.

The polynomial having two terms is called a binomial. That is binomial is sum of two monomials.

The polynomial having three terms is called a trinomial. That is trinomial is sum of three monomials.

The given expression is $3y^2−2$.

It can be noticed that each term of the given expression is a number and the product of a number and one variable with non-negative integer exponents.

Therefore, each term of the given expression is a monomial.

As, the given expression is the sum of the monomials. Therefore, the given expression is a polynomial.

The given expression is a polynomial having two terms that is the given polynomial is sum of two monomials.

Therefore, the given polynomial $3y^2−2$is a binomial.