WordNet sense 1 ((computer science) a single execution of a set of instructions that are to be repeated):

iteration

WordNet sense 2 (the topology of a network whose components are serially connected in such a way that the last component is connected to the first component):

loop topology

WordNet sense 3 (fastener consisting of a metal ring for lining a small hole to permit the attachment of cords or lines):

eyelet, grommet, grummet, cringle

WordNet sense 4 (a complete electrical circuit around which current flows or a signal circulates):

closed circuit

WordNet sense 5 (make a loop in):

intertwine

WordNet sense 6 (wind around something in coils or loops):

coil, curl

WordNet sense 7 (a flight maneuver; aircraft flies a complete circle in the vertical plane):

loop-the-loop