Answer:
Parts Of Speech (POS) tagging.
Step-by-step explanation:
Natural Language Processing (NPL) is the process that helps the computers to understand human language.
Human language is very intricate yet very unique. To make computers understand human languages is a difficult task as humans language involves many facets.
The system that helps in identifying the root of the word is Parts of speech tagging. When a word is used as a noun, verb, pronouns, adverbs, etc. it is this system that identifies the words original meaning with correspondence to adjacent words or phrases.
In the given question, to identify the "run" as a noun and verb, Parts of speech tagging is used.