not a mnemonic.. just something that can help.. aviary is where birds are kept and apiary is where bees are kept.. this might help relate in some way..
It can be related to aviation, aviation is related to flying and BIRDS fly.
AVIARY->consider the 1st 3 letters AVI similar to OVI..and generally BIRDS are OVIPAROUS..hence AVIARY is an ENCLOSURE FOR BIRDS
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