cardiovascular system vs pump

cardiovascular system and pump both are nouns.

Word	Noun	Adjective	Verb	Adverb
cardiovascular system	Yes	No	No	No
pump	Yes	No	Yes	No

cardiovascular system (noun)	pump (noun)
the organs and tissues involved in circulating blood and lymph through the body	a mechanical device that moves fluid or gas by pressure or suction
	a low-cut shoe without fastenings
	the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body

cardiovascular system (verb)	pump (verb)
	question persistently
	deliver forth
	operate like a pump; move up and down, like a handle or a pedal
	raise (gases or fluids) with a pump
	draw or pour with a pump
	flow intermittently
	move up and down
	supply in great quantities