poller

The English word “poller” has 5 meanings listed here.

noun

one who polls or lops trees
one who cuts hair; a barber
one who votes
one who registers voters or conducts a poll
a task or process that periodically checks for a condition being satisfied, such as the availability of new data

From poll + -er.

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