tracker

Pronunciation: /ˈtɹækə(ɹ)/

The English word “tracker” has 9 meanings listed here.

noun

A person employed to follow and monitor a political rival.
An Indigenous Australian employed by the law to track down fugitives and missing persons.
In an organ, a light strip of wood connecting (in path) a key and a pallet, to communicate motion by pulling.
A type of computer software for composing music by aligning notes or samples on parallel timelines.
A musician who writes music in a tracker.
A computer program that monitors something.
Server software that coordinates peers in the BitTorrent protocol.
A tracker mortgage.
An album with the specified number of tracks.

From track + -er.

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