rastreador
/rastɾeaˈdoɾ/ · B2 · noun · m
tracker
📡 rastreador = rastrear (to trace a trail) + -dor (one who does it)
Rastro means trail or track, and rastrear means to follow that trail. Add -dor, the suffix for an agent that does something, and you get the one that follows trails: a tracker, whether software or a device.