lower limit vs demarcation

lower limit and demarcation both are nouns.

Word	Noun	Adjective	Verb	Adverb
lower limit	Yes	No	No	No
demarcation	Yes	No	No	No

As nouns, demarcation is a hypernym of lower limit; that is, demarcation is a word with a broader meaning than lower limit:

Other hypernyms of lower limit include demarcation line, limit.

lower limit (noun)	demarcation (noun)
the limit on the lower (or southernmost) side of something	a conceptual separation or distinction
the smallest possible quantity	the boundary of a specific area