different between feyness vs keyness

English

fey +? -ness

feyness (countable and uncountable, plural feynesses)

The state of being fey.
(Shetland, folklore, countable) A ghost resembling a living person, seeing which is an omen of that person's death.

key +? -ness

keyness (uncountable)

(anthropology) The degree to which something is key, or important.
(computational linguistics) The statistical significance of a keyword's frequency in a given corpus, relative to a reference corpus.

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