hirn

As nouns the difference between hirn and firn

is that hirn is corner; nook; hiding-place while firn is a type of old snow which has gone through multiple thaw and refreeze cycles and thus is made of numerous small icy grains, though it is not nearly as saturated with water as snow-cone slush is; can be hard or somewhat soft depending on recent and current weather conditions.

As a proper noun horn

is one of the names of freyja.

As a noun hirn is

corner; nook; hiding-place.

As nouns the difference between nook and hirn

is that nook is a small corner formed by two walls; an alcove or recess or ancone while hirn is corner; nook; hiding-place.