In zoology|lang=en terms the difference between cynodontid and synodontid
is that cynodontid is (zoology) any member of the cynodontidae while synodontid is (zoology) any member of the synodontidae.
As nouns the difference between cynodontid and synodontid
is that cynodontid is (zoology) any member of the cynodontidae while synodontid is (zoology) any member of the synodontidae.