3 letters:
gar, gyr

4 letters:
dire, gaar, gahr, gaia, gair, gare, garr, gear, geer, geib, geil, geis, ghio, gile, goar, gohr, gore, gorr, guys, hyre, lyre, mire, myre, tyre, wyre

5 letters:
geier, geise, geiss, gille, guice, guide, guier, guile, guise, guy's, guyer, guynn, guys', scire, shire, guire

6 letters:
beijer, guerre