Words starting with "u":
* up
* under
* ugly
* umbrella
* unhappy
* uncle
* understand
* until
* use
* us
Words starting with "u" followed by a consonant:
* truck
* trunk
* drum
* jump
* crumb
* front (the "u" is silent here, but the sound is still present)
Important Note: While these words start with the short "u" sound, some of them may be spelled with "u" followed by other letters. The sound is what matters for this exercise.