order Testudines vs Chelonia

order Testudines and Chelonia both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Testudines	Yes	No	No	No
Chelonia	Yes	No	No	No

As nouns, order Testudines and Chelonia are synonyms defined as:

Other synonyms of order Testudines include order Chelonia, order Testudinata, Testudinata, Testudines.

order Testudines (noun)	Chelonia (noun)
tortoises and turtles	tortoises and turtles
	green turtles