order Chelonia vs order Testudines

order Chelonia and order Testudines both are nouns.

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

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

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

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