a suffix used in forming nouns, often derogatory, referring especially to occupation, habit, or association: gamester; songster; trickster.

Middle English; Old English -estre; cognate with Dutch -ster, Middle Low German -(e)ster

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suffix forming nouns
1.  Compare -stress indicating a person who is engaged in a certain activity: prankster; songster
2.  indicating a person associated with or being something specified: mobster; youngster
[Old English -estre]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

O.E. -istre, from P.Gmc. *-istrijon, feminine agent suffix used as the equivalent of masculine -ere. Also used in M.E. to form nouns of action (meaning "a person who ...") without regard for gender. The genderless agent noun use apparently was a broader application of the original feminine suffix, beginning
in the north of England, but linguists disagree over whether this indicates female domination of weaving and baking trades, as represented in names like Webster, Baxter, Brewster, etc. (though spinster clearly represents a female ending). In Modern Eng., the suffix has been productive in forming derivative nouns (gamester, punster, etc.).
Online Etymology Dictionary, © 2010 Douglas Harper
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