systema lymphaticum vs lymph vessel

systema lymphaticum and lymph vessel both are nouns.

Word	Noun	Adjective	Verb	Adverb
systema lymphaticum	Yes	No	No	No
lymph vessel	Yes	No	No	No

systema lymphaticum (noun)	lymph vessel (noun)
the interconnected system of spaces and vessels between body tissues and organs by which lymph circulates throughout the body	a vascular duct that carries lymph which is eventually added to the venous blood circulation