heart muscle vs pump

heart muscle and pump both are nouns.

Word	Noun	Adjective	Verb	Adverb
heart muscle	Yes	No	No	No
pump	Yes	No	Yes	No

heart muscle (noun)	pump (noun)
the muscle tissue of the heart; adapted to continued rhythmic contraction	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

heart muscle (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