The difference between Previously and Yesteryear
Previously is also adverb with the meaning: at an earlier time.
Yesteryear is also noun with the meaning: past years.
check bellow for the other definitions of Previously and Yesteryear
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Previously as an adverb:
At an earlier time.
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Yesteryear as a noun (poetic):
Past years; time gone by; yore.
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Yesteryear as a noun (rare):
Last year.