limen vs threshold

limen and threshold both are nouns.

Word	Noun	Adjective	Verb	Adverb
limen	Yes	No	No	No
threshold	Yes	No	No	No

As nouns, limen and threshold are synonyms defined as:

limen (noun)	threshold (noun)
the smallest detectable sensation	the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway
	the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close
	the smallest detectable sensation
	a region marking a boundary
	the starting point for a new state or experience