sump vs reservoir

sump and reservoir both are nouns.

Word	Noun	Adjective	Verb	Adverb
sump	Yes	No	No	No
reservoir	Yes	No	No	No

As nouns, reservoir is a hypernym of sump; that is, reservoir is a word with a broader meaning than sump:

sump (noun)	reservoir (noun)
a well or other hole in which water has collected	tank used for collecting and storing a liquid (as water or oil)
an oil reservoir in an internal combustion engine	lake used to store water for community use; a lake (natural or artificial) used to store water and used as a source of water
a covered cistern; waste water and sewage flow into it	anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies
	a large or extra supply of something