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Complainer
noun – A person who makes frequent complaints usually about little things.
Usage example: she early on got a reputation as a complainer after finding fault with her work space
Grumbler is a synonym for
complainer in
happy topic. In some cases you can use "Grumbler" instead a
noun "Complainer", when it comes to topics like ill-tempered person,
dissenter,
whiner.
popular alternative