One of the mysteries of the English language finally explained.
1(forming nouns) denoting a person concerned with or engaged in an activity.‘auctioneer’‘puppeteer’
2(forming verbs) denoting concern or involvement with an activity.‘electioneer’‘profiteer’
From French -ier, from Latin -arius; verbs are often back-formations (e.g. electioneer from electioneering).
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