worker

noun

Etymology: From Middle English werkere, worcher, wercher, equivalent to work + -er. Displaced the older term wright, from Old English wyrhta.

1. One who works: a person who performs labor for a living; traditionally, especially, manual labor.

   “Near-synonym: employee”

   “Fret not thy ſelfe becauſe of euill doers, neither bee thou enuious againſt the workers of iniquitie.”

2. A nonreproductive social insect, such as ant, bee, termite, or wasp.
3. A nonreproductive social insect, such as ant, bee, termite, or wasp.
4. A thread performing one instance of a particular task within a program.

   “This FTP client spawns a separate worker for each file to be uploaded.”