Itself.
stabilization
Strait
other
Star, stat, stop, stir, and step are some four letter words with the second letter 't'
Some five letter words with second letter U and fifth letter T are:auditbuiltburntburstcubitduvetguestguiltoughtquartquestquiltquintwurst
Poet
court
Meant or beret.
Five letter words with the second and fourth letter O are:boronbosomcocoacoloncolordonorhonormoronmotorrobotrotor
Strauss
step
stillettos