No. They’re all terrorists. All states, all nexuses of control, can be defined as terrorists, if we broaden our definition of terrorist to include states and all their apparatuses. In particular, with reference to the state’s effective monopoly on legal violence.

But, amongst those options, you should have the intelligence to choose the least bad.

“The United States is the world's biggest terrorist”, is IMHO almost a meaningless claim. It is true, arguably, but in that case it is irrelevant.

Based on this interpretation, the US is far from the worst powers in our world. In fact it is above the median.