limen vs sense datum

limen and sense datum both are nouns.

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

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

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

limen (noun)	sense datum (noun)
the smallest detectable sensation	an unelaborated elementary awareness of stimulation