The ornamental design for a broomhead, as shown and described.
FIG. 1 is a perspective view of the new design for a broom head;
FIG. 2 is a right side view thereof, the left side view being a mirror image thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a reduced perspective view thereof showing the broom head with a long handle.
The portions of the broom head shown in broken lines in the figures along with the environmental broken line showing of a handle in FIG. 7 form no part of the claimed design.