What is and what's not a Dinosaur

Notes:

inb4 muh childhood
Source
Red are the non-archosaurs, yellow are non-dinosaurian archosaurs /dinosaur relatives, and green are dinosaurs.
From Left to right
A Dimetrodon which is a proto-mammal synapsid
A Ichthyosaur which are a group of reptiles unrelated to dinosaurs
A Plesiosaur which are a group of reptiles unrelated to dinosaurs
A Mosasaur which are marine lizards
A memeber of Pseudosuchia which are archosaurs which are more closely related to crocs
A Pteranodon which is a Pterosaur which are archosaurs that are closely related Dinosaurs
A Flying Dinosaur
And a Tyrannosaur