Please scroll down for the updated BUR that replaced this initial one.
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The bulk update request #4213 has been rejected.
create alias eggshell (151) -> egg_shell (7)
create alias egg_shells (1) -> egg_shell (7)
Reason: Standardize on the spelling with a space, plus a plural-to-singular.
I am pretty sure they all mean the same thing - the thin, hard outer coating of a bird egg.
EDIT: The bulk update request #4213 (forum #358264) has been rejected by @kora_viridian.
Updated