Or "fount" from older, non-American English.
Fount is definitely more correct. If we're talking a baptismal font, then it's font, but if were talking a fount of knowledge, the correct term is fount with font sometimes being used but derived from fount.
Etymology 1, meaning 3: https://en.wiktionary.org/wiki/fount
Etymology 3: https://en.wiktionary.org/wiki/font
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Fount is definitely more correct. If we're talking a baptismal font, then it's font, but if were talking a fount of knowledge, the correct term is fount with font sometimes being used but derived from fount.
Etymology 1, meaning 3: https://en.wiktionary.org/wiki/fount
Etymology 3: https://en.wiktionary.org/wiki/font