The picture would be a LINE.
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collinear means on the same line so they would be collinear if they are on the same line.!
Not sure about complanar. Coplanar lines can be collinear but need not be.
Points are collinear if they lie on the same line.
I dont think that "If four points are collinear they are also coplaner," is the same thing as "If four points are coplaner they are also collinear,". The definition of collinear is at least three points on the same line. To define a plane is to have threenoncollinear points.
That's the whole point. "Collinear" means they are on the same line.