water vs reservoir

water and reservoir both are nouns.

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

water (noun)	reservoir (noun)
a facility that provides a source of water	tank used for collecting and storing a liquid (as water or oil)
a liquid necessary for the life of most animals and plants	lake used to store water for community use; a lake (natural or artificial) used to store water and used as a source of water
the part of the earth's surface covered with water (such as a river or lake or ocean)	anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies
binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent	a large or extra supply of something
liquid excretory product
once thought to be one of four elements composing the universe (Empedocles), associated with the humour phlegm

water (verb)	reservoir (verb)
secrete or form water, as tears or saliva
supply with water, as with channels or ditches or streams
fill with tears
provide with water