https://en.m.wikipedia.org/wiki/Velociraptor#/media/File%3AV...
Yeah, basically a weird bird.
The opposite. Birds are a type of dinosaurs, but the biggest dinosaurs like Triceratops weren't birds. I'm not wrong, feathers were found in small or middle sized dinosaurs, smaller than the elephant birds.
So no, the title is not really wrong unless there is a yet undiscovered bird that's even larger. The elephant bird was the biggest bird (or avian-dinosaur) that ever existed. It was smaller than other non-avian dinosaurs but these were not birds so no point comparing.
The confusion you are making is sometimes described as politician's syllogism. [0]
1) All birds are dinosaurs
2) All land dinosaurs are dinosaurs
3) Therefore, land dinosaurs are birds
birds are dinosaurs and dinosaurs aren't birds
you've reversed the vectored direction of time in your claim
Edit: And what does "vector" add to your sentences?
