pump vs cardiac muscle

pump and cardiac muscle both are nouns.

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

pump (noun)	cardiac muscle (noun)
a mechanical device that moves fluid or gas by pressure or suction	the muscle tissue of the heart; adapted to continued rhythmic contraction
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

pump (verb)	cardiac muscle (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