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This might sound like a blinding thrust into the obvious, but a word is anything which is intelligible to the reader or the hearer as a communication with a meaning which is understood, or which is understandable by studying the language or culture of the communicator.

Therefore, "Mt Fuji" is a word, or perhaps two words, and it matters not if it has an antonym or an unclnym. It is a word in any event, or, more precisely, it is two words together producing a name, and that name is a word.

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So right you really are, wordminstrel, but, arr-uh, your obviousness doesn't translate into the sublime finesse of the hitherto electronic conversation. Namely...
Here we are investigating the extent of word meanings in-as-much as they can confine ( and thereby delimitate definitions in a socratic manner.) Obviousnessly, you can restrict a definition to fit a form that is functional. Semantically.

But...can we invent a form which provides insight into the nature of human communication by the delimiting nature of semantical modeling?

I think we can.

(by-the-way, what is an unclymn?)