stickler
/ˈstɪk.lə/ noun C2- A referee or adjudicator at a fight, wrestling match, duel, etc. who ensures fair play.
- Someone who insistently advocates for something, especially for strict observance of a formal rule. · Lexicographers are sticklers for correct language.
Plural sticklers
From the library
“Ah,” said Morcerf, “I see you are a stickler for forms, my dear sir, and you would remind me that the ceremonial rites should not be omitted.
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