We found one dictionary that defines the word shriekery:

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1. shriekery: Wiktionary

Definitions from Wiktionary (shriekery) ▸ noun:  (rare) Shrieking. ▸ Words similar to shriekery ▸ Usage examples for shriekery ▸ Idioms related to shriekery ▸ Wikipedia articles (New!) ▸ Popular adjectives describing shriekery ▸ Words that often appear near shriekery ▸ Rhymes of shriekery ▸ Invented words related to shriekery