Noel (Christmas) is one holiday with four letters.
deck, trim, gild, bead, hang
Four Letter Words in Christmascats castcisthatshissmassmastmatsmissmistrichstarstirtrim
Some four letter words with second letter U and fourth letter O are:autoeurojudokudoouzo
Star, stat, stop, stir, and step are some four letter words with the second letter 't'
WIND
Some four letter words with a second letter U are:auraburncurbcuredulldumbeurofundguruhugejumpjunklumpluremuchmutenudeoustpullpurepushrulerumpruinruserushrustsuchsurftune
open
dyes
Haul and laud are four letter words. The 2nd letter is a. The 3rd letter is u.
Japan
Some four-letter words with the second letter "o" include: book, food, foot, pool, look, loop, cool, and soon. These words all have the commonality of having the letter "o" as the second letter in their spelling.