conjunction / preposition / noun
but
BUT/bət/
Introduces an exception or contrast to what was said.
Everyone but one diner receives dessert; that diner gets vegetables.

Etymology
The combination of “by” and “out” conveyed “outside” or “without.” That idea extended to exceptions—something outside a statement’s scope—and then to the contrasting force of the conjunction.
In context
the video is fake, but the people are real.
And we can help them but we can't do it for them.
More examples
- Everyone but Ravi had already arrived.
- She agreed, with one important but about the cost.
- The plan is simple but surprisingly effective.
Forms
but · buts
Similar words
- however
- Introduces contrast, but does not normally function as an exception preposition.