systema respiratorium vs respiratory system

systema respiratorium and respiratory system both are nouns.

Word	Noun	Adjective	Verb	Adverb
systema respiratorium	Yes	No	No	No
respiratory system	Yes	No	No	No

As nouns, systema respiratorium and respiratory system are synonyms defined as:

systema respiratorium and respiratory system: the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing

systema respiratorium (noun)	respiratory system (noun)
the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing	the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing