2 Words to use with nexus

If I had any authority, I should soon produce in the heads of these carters an inseparable nexus idearum between cracking a whip and receiving a whipping.

The fact that in the world of phenomena the causal nexus proceeds without interruption and without end, so that there is no room in it either for an absolutely necessary Being or for freedom, does not conflict with this other, that beyond the world of sense there may exist an omnipotent, omniscient cause of the world, and an intelligible freedom as the ground of our empirically necessary actions.

2 Words to use with  nexus