Some three letter words that start with U are:
ugh
umm
ump
ups
urn
use
Ute
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Ah, the usual question.
Ural
Understanding is a good word. It begins with the letter U.
usurps, unfold, untrue
The 3-letter Greek letters that start with a "p" are phi and psi. The 3-letter Greek letter that ends in a "u" is tau. Other 3-letter Greek letters are eta, rho and chi. You work it out.