No. The word 'runner' is a noun. It is not a verb because you can 'do' it. For example, one would not say "I am runner to the shops." They would say "I am running to the shops." 'Run' is the verb that you seek. A runner is somebody who runs, put simply.
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No, it is not. It is a plural noun (people who run, extensions of grass, or narrow floor coverings).