Definition of complainer in US English:

complainer

noun

  • See complain

    • ‘It merely brands you as the department's top grumbler, grouch and complainer.’
    • ‘Do we really want the carpers and complainers, of whatever creed, to get programmes banned?’
    • ‘How do you handle persistent complainers or moaners effectively?’
    • ‘Where are the moaners and complainers when you really need them?’
    • ‘It seems that it is the complainers and grumblers who express their opinions.’

Pronunciation

complainer

/kəmˈpleɪnər//kəmˈplānər/