3 words for AEHNOORRTV 8-letter words

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8 letters (3)

Slit in the back of a jacket
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V
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E
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N
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Hint 1 meaning
The anal opening of certain invertebrates and fishes; also, the external cloacal opening of reptiles, birds, amphibians, and many fishes.
Hint 2 anagram
ETNV
Hint 3 another clue
Discharge
3 +1