ice vs H2O

ice and H2O both are nouns.

Word	Noun	Adjective	Verb	Adverb
ice	Yes	No	Yes	No
H2O	Yes	No	No	No

ice (noun)	H2O (noun)
a rink with a floor of ice for ice hockey or ice skating	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
an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
a frozen dessert with fruit flavoring (especially one containing no milk)
a flavored sugar topping used to coat and decorate cakes
the frozen part of a body of water
diamonds
water frozen in the solid state