continuousness vs endlessness

continuousness and endlessness both are nouns.

Word	Noun	Adjective	Verb	Adverb
continuousness	Yes	No	No	No
endlessness	Yes	No	No	No

As nouns, endlessness is a hypernym of continuousness; that is, endlessness is a word with a broader meaning than continuousness:

continuousness: the quality of something that continues without end or interruption
endlessness: the property of being (or seeming to be) without end

continuousness (noun)	endlessness (noun)
the quality of something that continues without end or interruption	the property of being (or seeming to be) without end