jnd vs difference threshold

jnd and difference threshold both are nouns.

Word	Noun	Adjective	Verb	Adverb
jnd	Yes	No	No	No
difference threshold	Yes	No	No	No

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

jnd: (psychophysics) the difference between two stimuli that (under properly controlled experimental conditions) is detected as often as it is undetected
difference threshold: the smallest change in stimulation that a person can detect

Other hypernyms of jnd include difference limen, differential limen, differential threshold.

jnd (noun)	difference threshold (noun)
(psychophysics) the difference between two stimuli that (under properly controlled experimental conditions) is detected as often as it is undetected	the smallest change in stimulation that a person can detect