Global Entry vs Nexus Card [duplicate]

There is a duplicate here.

The answers by both @dunni and @Coke are correct though they express slightly different concepts which cause them to appear contradictory. The summary of the points is as follows:

• Being a member of either Global Entry or Nexus programs allows you accelerated access to enter the US at both Canadian pre-clearance locations, US airports and other pre-clearance locations in the world.
• In order to use the kiosk at a Canadian pre-clearance location as a global entry or Nexus program member you must present either a Nexus card (the physical piece of plastic) OR a passport/green card (Physical document). Only one of those two documents must be physically presented/be in your immediate possession.
• In order to use the kiosk at an entry point Kiosk outside of Canada as a Nexus or global entry member, you must physically present your passport/green card.

There is a difference when arriving from Canada: NEXUS lets you enter the US without a passport, whilst the Global Entry card does not.

NEXUS members also get Global Entry benefits, so you can use the Global Entry kiosk with your passport to enter the US at any airport.