repletion vs fullness

repletion and fullness both are nouns.

Word	Noun	Adjective	Verb	Adverb
repletion	Yes	No	No	No
fullness	Yes	No	No	No

As nouns, fullness is a hypernym of repletion; that is, fullness is a word with a broader meaning than repletion:

repletion: the state of being satisfactorily full and unable to take on more
fullness: the condition of being filled to capacity

repletion (noun)	fullness (noun)
eating until excessively full	greatness of volume
the state of being satisfactorily full and unable to take on more	the property of a sensation that is rich and pleasing
	the condition of being filled to capacity
	completeness over a broad scope