systema lymphaticum vs lymphocyte

systema lymphaticum and lymphocyte both are nouns.

Word	Noun	Adjective	Verb	Adverb
systema lymphaticum	Yes	No	No	No
lymphocyte	Yes	No	No	No

systema lymphaticum (noun)	lymphocyte (noun)
the interconnected system of spaces and vessels between body tissues and organs by which lymph circulates throughout the body	an agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection