A person who uses guns, especially a gangster or criminal armed with firearms; a gunman.
From gun + -ster, a suffix meaning 'one who practices or is involved in' (from Old English -stre or Germanic roots). The -ster suffix often carried connotations of someone not formally trained, or someone involved in questionable activities.
The word 'gunster' reflects how English slang in the early 20th century created an entire vocabulary around organized crime and firearms—words like 'gunster,' 'mobster,' and 'gangster' all emerged in similar periods.
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