Answer
$y^2z^2$
Work Step by Step
\begin{align*}
\text{The $GCF$ of $
y^3,
y^2,
\text{ and }
y^2
\text{ is }
y^2
$}
.\\\\
\text{The $GCF$ of $
z^3,
z^3,
\text{ and }
z^2
\text{ is }
z^2
$}
.\end{align*}
Hence, the $GCF$ of the given expressions is $y^2z^2$.