As nouns the difference between owler and owlery
is that owler is the alder tree while owlery is an abode or a haunt of owls.
owler
English
Noun
(
en noun)
(Northern English dialect) The alder tree.
(dated) A smuggler of sheep or wool (see owling).
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owlery
English
Noun
(owleries)
(zoology) An abode or a haunt of owls.
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