Yes actually.

We could have said that,

\\[
F(\text{Employee}) = \lbrace \bullet ,\bigstar ,\blacklozenge ,\blacksquare \rbrace \\\\
F(\text{Department}) = \lbrace \ast,\circ ,\triangle , \square
\rbrace \\\\
F(\text{String}) = \lbrace \text{"oui"}, \text{"bluer"}, \text{"bop"}\rbrace
\\]

with,

\\[
\begin{align}
F(\text{WorkIn}) = \\\\
\bullet \mapsto \circ, \\\\
\bigstar \mapsto \triangle , \\\\
\blacklozenge \mapsto \ast ,\\\\
\blacksquare \mapsto \square,
\end{align}
\\]

and,

\\[
\begin{align}
F(\text{DepartmentName}) = \\\\
\ast \mapsto \text{"bop"}, \\\\
\circ \mapsto \text{"bop"}, \\\\
\triangle \mapsto \text{"oui"}, \\\\
\square \mapsto \text{"bluer"}.
\end{align}
\\]

This is a perfectly valid (if not very weird) instance.