fountainhead

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Noun fountainhead has 2 senses

well, wellspring, fountainhead - an abundant source; "she was a well of information"
--₁ is a kind of source
fountainhead, headspring, head - the source of water from which a stream arises; "they tracked him back toward the head of the stream"
--₂ is a kind of beginning, origin, root, rootage, source