9. Color each vertex of a regular tetrahedron with 1 color, and ensure that the two endpoints of the same edge are of different colors. If only 5 colors are available, the number of different coloring methods is $\qquad$ (coloring methods that are identical after rotation around the symmetry axis are considered the same coloring method)
9. 120
(1) If using 5 colors, there are $C_{5}^{I} \cdot(4-1) = 30$ methods;
(2) If using 4 colors, choosing 4 colors from 5, there are $C_{5}^{4}$ methods, the vertex has $C_{4}^{1}$ coloring methods, the base has $C_{3}^{1} \cdot(2-1)$! coloring methods, at this time there are $C_{5}^{4} \cdot C_{4}^{1} \cdot C_{3}^{1}(2-1)!=60$ methods;
(3) If using 3 colors, choosing 3 colors from 5, there are $C_{5}^{3}$ methods. The vertex has $C_{3}^{1}$ coloring methods, the base has $(2-1)$! coloring methods, at this time there are $C_{5}^{3} \cdot C_{3}^{1} \cdot(2-1)!=30$ methods.
Since at least 3 colors must be used, the total number of methods is $30+60+30=120$.