Full Idea
"Water" functions as a natural kind term, but "H2O" is a description, synonymous with an account of its atoms.
Gist of Idea
"Water" is a natural kind term, but "H2O" is a description
Source
Hilary Putnam (Representation and Reality [1988], §3 p.50)
Book Reference
Putnam,Hilary: 'Representation and Reality' [MIT 1992], p.50