tipster

The English word “tipster” has 2 meanings listed here.

noun

A person who provides tips or advice to others, for example on the form of racehorses or the stock market.
One who provides tips or hints on how to succeed at a game.

* From tip (etymology 5) + -ster.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.