Yes, pump is a Scrabble word!

Verb

1. Operate like a pump; move up and down, like a handle or a pedal

2. Deliver forth

3. Draw or pour with a pump

4. Supply in great quantities

5. Flow intermittently

6. Move up and down

7. Raise (gases or fluids) with a pump

8. Question persistently

Noun

1. A mechanical device that moves fluid or gas by pressure or suction

2. The hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body

3. A low-cut shoe without fastenings