lymphatic system vs lymph vessel

lymphatic system and lymph vessel both are nouns.

Word	Noun	Adjective	Verb	Adverb
lymphatic system	Yes	No	No	No
lymph vessel	Yes	No	No	No

lymphatic system (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