Archosaurian and Flying reptile

Archosaurian noun - Extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts.

Flying reptile and archosaurian are semantically related. In some cases you can replace phrase "Flying reptile" with "Archosaurian", this terms are similar.

Flying reptile noun - An extinct reptile of the Jurassic and Cretaceous having a bird-like beak and membranous wings supported by the very long fourth digit of each forelimb.

Archosaurian and flying reptile are semantically related. You can use "Archosaurian" instead a noun phrase "Flying reptile".