confundir

1. to confuse; to confound (to lead someone into an incorrect conclusion or uncertainty)
2. to be confused (by) (to make a mistake (due to))
3. to mix up; to confuse (to mistake things for one another)
4. (ditransitive, with the indirect object taking com or por (less common)) to mistake one thing for another
5. to merge; to syncretize (to form a combination from different elements)
6. (obsolete) to confound; to thwart; to frustrate; to foil (to prevent from happening or succeeding)