Here are all the the English 4 letter words starting with U from uang to uzan:
uang
ubii
ucal
udal
udic
udom
udos
ufer
ufos
ughs
ugli
ugly
uily
ukes
ulan
ulex
ulla
ulmo
ulna
ulta
ulto
ulua
ulus
ulva
umpy
umps
unai
unal
unau
unbe
unca
unci
unco
uncs
unct
unde
undy
undo
ungt
unie
unio
unit
univ
unix
unta
unto
untz
unum
upby
updo
upgo
upla
upon
upsy
ural
uran
urao
urbs
urde
urdy
urds
urdu
urea
urge
uria
uric
urim
urna
urns
urol
uroo
ursa
usar
used
usee
user
uses
ussr
usun
utah
utai
utas
utch
util
utum
uval
uvea
uvic
uvid
uvre
uzan
These can be used for scrabble but not wordle (which uses 5 letter words).