From Longman Dictionary of Contemporary Englisha good/hard/quick etc workera good/hard/quick etc workersomeone who works very well or quickly → worker
Examples from the Corpus
a good/hard/quick etc worker• He is supposedly not the hardest worker ever.• She was known to be very tough and a very hard worker.• She was such a hard worker and a wonderful cook.• The girl was a good worker who came and went quietly about her business.• He was a good, hard worker.• He made Mrs Timms look uninterested in her store, the Reliance Market, and she was a hard worker. 