fount » font
Spotted in the wild:
- “She was a font of wisdom and good sense.” (American Heritage Dictionary, 4th ed.)
The noun “knowledge” in the heading stands in for a variety of abstract nouns.
Treated at some length in my Language Log piece of 28 March 2005, “Chomping at the Font”. The noun “font”, as in “baptismal font” and “type font” and as a variant of poetic and metaphorical “fount” ’source, repository’, has been steadily gaining on metaphorical “fount”; this is a replacement of a less frequent and more specialized word by a more frequent phonologically similar word that makes sense in the context.