Surely, "tractor" and "puller" mean the same thing? Tractor and pusher, or puller and pusher are opposite.
Tractor/puller means that the tail rotor pulls in relation to the tail boom to counter main rotor torque reaction (e.g. Blackhawk, early Lynx). A pusher is physically fitted on the other side so it pushes the tail boom (e.g. most other helicopters).