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Definition of -er suffix from the Oxford Advanced American Dictionary

-er

suffix
/ər/ -er pronunciation American
 
1 (in nouns) a person or thing thatlovercomputer compare -ar, -ee, -or2 (in nouns) a person or thing that has the thing or quality mentionedthree-wheelerforeigner3 (in nouns) a person concerned withastronomerphilosopher4 (in nouns) a person belonging toNew Yorker5 (makes comparative adjectives and adverbs)widerbiggerhappiersooner compare -est