Social Security is not a pension plan, it's pay-as-you-go and barring massive tax increases and/or benefit cuts, its collapse is more-or-less inevitable in the next couple decades because of locked-in demographic changes.
The Social Security Retirement benefit is a monthly check that replaces part of your income when you reduce your hours or stop working altogether.
Most people would refer to this as a “pension”. Call it whatever you want to. The fact is that its issues are easily fixable and your benefit is based on how much you put into it.