stickler
noun
[ ˈstɪklə ]
• a person who insists on a certain quality or type of behaviour.
• "he's a stickler for accuracy"
Origin:
mid 16th century (in the sense ‘umpire’): from obsolete stickle ‘be umpire’, alteration of obsolete stightle ‘to control’, frequentative of Old English stiht(i)an ‘set in order’.
