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Ghost words have nothing to do with otherworldly apparitions, but they're enough to scare the headwords off lexicographers.

Because the Oxford English Dictionary is edited and published in England, British forms take precedence: in the online dictionary, it appears under the headword Covid-19.

A dictionary is really a database; it has fields for headword, pronunciation, etymology, definition, and in the case of historical dictionaries like the OED, citations of past usages.

Since both headwords have a long vowel, the cross-reference was changed to match.

Yogh is used in dictionary headwords; the others occur only in etymologies.