Definition of -er suffix from the Oxford Advanced American Dictionary

     

    -er

     suffix
    suffix
    NAmE//ər//
     
     
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  1. 1(in nouns) a person or thing that lover computer compare -ar, -ee, -or
  2. 2(in nouns) a person or thing that has the thing or quality mentioned three-wheeler foreigner
  3. 3(in nouns) a person concerned with astronomer philosopher
  4. 4(in nouns) a person belonging to New Yorker
  5. 5(makes comparative adjectives and adverbs) wider bigger happier sooner compare -est
See the Oxford Advanced Learner's Dictionary entry: -er