5 words for EEOOOOPPPPRRSSSS 1-letter words

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1 letter (5)

e o p r s
Powerful blow
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W
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A
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L
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P
Hint 1 meaning
To boil with a continued bubbling or heaving and rolling, with noise.
Hint 2 anagram
LOALPW
Hint 3 another clue
BATTER ___
3 +1