water vs atomic number 1

water and atomic number 1 both are nouns.

Word	Noun	Adjective	Verb	Adverb
water	Yes	No	Yes	No
atomic number 1	Yes	No	No	No

water (noun)	atomic number 1 (noun)
a facility that provides a source of water	a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
a liquid necessary for the life of most animals and plants
the part of the earth's surface covered with water (such as a river or lake or ocean)
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
liquid excretory product
once thought to be one of four elements composing the universe (Empedocles), associated with the humour phlegm

water (verb)	atomic number 1 (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