order Chelonia vs order Testudinata

order Chelonia and order Testudinata both are nouns.

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

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

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

order Chelonia (noun)	order Testudinata (noun)
tortoises and turtles	tortoises and turtles