As nouns the difference between lute and luth
is that
lute is a fretted stringed instrument, similar to a guitar, having a bowl-shaped body or soundbox or
lute can be thick sticky clay or cement used to close up a hole or gap, especially to make something air-tight while
luth is alternative form of.
As a verb lute
is to play on a lute, or as if on a lute or
lute can be to fix or fasten something with lute.