threshold vs sense datum

threshold and sense datum both are nouns.

Word	Noun	Adjective	Verb	Adverb
threshold	Yes	No	No	No
sense datum	Yes	No	No	No

As nouns, sense datum is a hypernym of threshold; that is, sense datum is a word with a broader meaning than threshold:

Other hypernyms of threshold include aesthesis, esthesis, sensation, sense experience, sense impression.

threshold (noun)	sense datum (noun)
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	an unelaborated elementary awareness of stimulation
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