What's the difference between finespun and hairsplitting?

Finespun

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Definition:

• (a.) Spun so as to be fine; drawn to a fine thread; attenuated; hence, unsubstantial; visionary; as, finespun theories.

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Hairsplitting

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Definition:

• (a.) Making excessively nice or trivial distinctions in reasoning; subtle.
• (n.) The act or practice of making trivial distinctions.

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