The difference between Ereyesterday and Yestern
When used as nouns, ereyesterday means the day before yesterday, whereas yestern means yesterday.
When used as adverbs, ereyesterday means on the day before yesterday, whereas yestern means yesterday.
Yestern is also adjective with the meaning: of or pertaining to yesterday.
check bellow for the other definitions of Ereyesterday and Yestern
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Ereyesterday as an adverb (obsolete):
On the day before yesterday.
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Ereyesterday as a noun (obsolete):
The day before yesterday.
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Yestern as an adjective (archaic, rare):
Of or pertaining to yesterday.
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Yestern as an adverb:
Yesterday.
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Yestern as a noun:
Yesterday.