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Explanation: I suppose the choice should depend on the context. If it's a technical, medical text, both are appropriate, with possible preferance to ledan. However, in a layman text, or spoken situation, the common term is nartik, and ledan is overly technical and not well known.
"pot" - according to definitions e.g. starmed, the term refers to the entire external area including vulva, clitoris, hymen and the vaginal opening.