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hard water vs H2O

H2O vs hard water

hard water and H2O both are nouns.

Word NounAdjectiveVerbAdverb
hard water Yes No No No
H2O Yes No No No
As nouns, H2O is a hypernym of hard water; that is, H2O is a word with a broader meaning than hard water:
  • hard water: water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap
  • H2O: 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
Other hypernyms of hard water include water.
hard water (noun) H2O (noun)
water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap 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
Difference between hard water and H2O

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