Words with the same vowel sound as "pump":
* cup
* sun
* run
* up
* shut
* luck
* drum
* jump
* lunch
* much
* truck
* dull
* fun
* but
* cut
Note: The spelling of the vowel sound can vary, but the sound itself is the same. For example, "cup," "sun," and "run" all have the same vowel sound, even though they are spelled differently.